Thomas Moran

Thomas Moran: Introduction

Thomas Moran (1837–1926) was an American painter, watercolourist and printmaker whose landscapes helped shape public ideas of the American West. Born in Bolton, England, and raised in Philadelphia, he developed through family instruction, close study of nature and the example of European art. Yellowstone and the Grand Canyon supplied his most celebrated subjects, but his work also includes Pennsylvania woods, Long Island fields, Venice and the sea. ^[1]

His pictures combine observed places with deliberate composition. Colour, light, rock and water become ways of organising an experience for the viewer. A canyon can unfold as a vast public spectacle; a wooded creek can offer a more intimate encounter. Seeing both sides of his work reveals a career broader than the familiar story of one artist and the national parks.

At a Glance

• Born12 February 1837, Bolton, Lancashire, England
• Died25 August 1926, Santa Barbara, California
• Principal mediaOil painting, watercolour, drawing and printmaking
• Early basePhiladelphia; later Newark and New York
• First Yellowstone journey1871, with part of Ferdinand V. Hayden’s survey party
• First Grand Canyon journey1873, with John Wesley Powell
• FamilyMarried Mary Nimmo Moran, an artist and printmaker, in 1863
• East Hampton studioBuilt in 1884; family moved in during 1885
• Major public paintingsThe Grand Canyon of the Yellowstone and The Chasm of the Colorado

Contents

1. Why Moran matters
2. An immigrant family and an artistic education
3. Turner, observation and idealisation
4. Pennsylvania before Yellowstone
5. Yellowstone and the monumental canvas
6. The Grand Canyon and a different kind of grandeur
7. Green River: repeated subjects, distinct paintings
8. Holy Cross and the language of landscape
9. Watercolours as more than field notes
10. Prints, publishers and audiences

Why Moran matters

Moran’s achievement lies partly in making unfamiliar landscapes compelling to audiences far from them. The enormous western canvases joined detailed observation to a scale normally associated with ambitious exhibition pictures. Viewers could study individual rock forms and trees while being confronted by a landscape that seemed to extend beyond ordinary experience. The picture offered information, but also an occasion for wonder.

That work belonged to a wider nineteenth-century culture of surveys, illustrated publications, exhibitions and travel. Moran was not an isolated discoverer reporting on an empty country. He worked alongside scientists, photographers, guides, publishers and promoters. His images reached audiences through different routes, from a magazine page to a canvas purchased by Congress. Understanding those routes makes the art’s public importance more precise.

He also matters as an artist who worked across media. A small paper study could preserve colour and outline; a drawing prepared for engraving had to survive another person’s translation into print; an etching offered its own possibilities of line and tone. The large oils are central to his reputation, but they do not contain the whole of his visual intelligence.

His long career allows unusually revealing comparisons. The bright foliage of an early Pennsylvania creek can be set beside Yellowstone’s luminous walls. A later Long Island evening can be compared with a dramatic seascape. Such pairings show recurring interests in reflection, atmosphere and the direction of the eye, even when the subjects and formats change. They also prevent the western masterpieces from turning every other work into a mere preliminary exercise.

An immigrant family and an artistic education

Moran arrived in Philadelphia with his mother and siblings in 1844, joining his father, who had emigrated earlier. The family came from the textile world of industrial Bolton and settled in Kensington, a working district of Philadelphia. His eventual profession was not inherited as a ready-made place in an artistic establishment. It emerged through work, study and the example of his older brother Edward. ^[1]

Edward’s encouragement helped Thomas move towards painting. Other members of the family also developed artistic careers, including John as a photographer and Peter as a painter and printmaker. Their activities offered overlapping ways of looking at landscape. Drawing, painting, engraving and photography were present within the family’s professional world, rather than kept in entirely separate compartments.

Thomas entered the Philadelphia wood-engraving firm Scattergood and Telfer as an apprentice in 1853. He left before completing the apprenticeship, during the middle of the decade, and worked with Edward. The episode introduced him to a trade in which images were designed for reproduction. It did not amount to a full academic training as a painter, and precise accounts of its duration differ.

Philadelphia supplied other forms of education. Works exhibited at the Pennsylvania Academy of the Fine Arts, pictures in dealers’ galleries, illustrated books and the advice of artists all contributed. Paul Weber and James Hamilton were important early examples. The resulting education was varied and practical: Moran could learn from a forest painting, a print after Turner or a discussion in an artist’s studio.

Calling him self-taught can therefore be misleading if it suggests that he received no help. He did not follow one conventional academy course, but neither did he invent his methods without models or instruction. His biography follows those relationships and journeys in greater detail. They explain how an ambitious young artist assembled an education from the opportunities available to him.

Turner, observation and idealisation

J. M. W. Turner was especially important. Moran first knew much of Turner’s work through reproductions, then travelled to England with Edward in 1862 to see paintings firsthand. The encounter gave colour and light a presence that monochrome prints could not fully communicate. Turner’s example also offered ways to make landscape expressive rather than simply descriptive. ^[1]

Moran did not study personally with Turner, who had died before that journey. Influence is not the same as direct tuition. He learned from works, prints and the wider discussion of them, as well as from artists who had themselves studied Turner. That distinction matters when describing the artistic relationships behind his development.

His own published statements emphasised selection. In G. W. Sheldon’s American Painters, issued in 1879, he described his tendencies as directed towards idealisation and rejected literal transcription as the final purpose of art. Observed features could be reorganised to convey an artistic idea. A painting might remain rooted in a place while refusing to behave like a map. ^[2]

The artist’s later interview in Brush and Pencil, published in 1903, returned to knowledge and technique. He argued that sight alone was insufficient and treated technical skill as a means towards a larger end. These remarks came from an established painter looking back over decades of practice. They provide context for his outlook without explaining every individual canvas. ^[3]

Observation and idealisation consequently belong together in his work. The shape of a tree or rock matters, but so does its position within the picture. Light can reveal a surface while also leading attention towards another part of the landscape. The question is not simply whether Moran exaggerated. It is how his choices make a particular scene intelligible, memorable or emotionally powerful.

Pennsylvania before Yellowstone

Moran’s early landscapes show those interests already developing. The Juniata, Evening, dated 1864 in the National Gallery of Art’s collection, places a river landscape within evening light. The work belongs to his eastern practice well before his first Yellowstone journey. Its date alone makes it a useful corrective to the idea that western travel created his interest in landscape colour. ^[4]

The same year’s Autumn Afternoon, the Wissahickon combines cattle, reflective water, wooded slopes and bright foliage. Terra’s current title identifies a canvas also known under an earlier autumn Wissahickon title. The seasonal colour is striking, but its effect depends on quieter elements: shaded water, pale rock and a hazy opening towards the distance. ^[5]

The early opus list, transcribed in the National Gallery catalogue, records Moran’s assessment of that 1864 picture as his best so far. It also records a charcoal design, a photographic reproduction of the design and a dealer transaction. The painting was both an artistic achievement and an object moving through a market. These practical records bring the young artist into focus without diminishing the finished landscape. ^[1]

Children of the Mountain offers another aspect of the early career. Its subject was documented in 1865, and the catalogue chronology records completion in December 1866, agreeing with the museum’s date. A differing 1867 catalogue-entry date coincides with the Paris exhibition year. The water, cloud, trees and rock form an imagined mountain scene. It should not be assigned to a western expedition that had not yet occurred.

In Forest Scene, dated 1870 in the catalogue, enclosed trees and changing light create a more intimate experience. The work demonstrates that a modest wooded subject could carry sustained attention. Later western paintings enlarged the geographical and physical scale of Moran’s practice; they did not eliminate his ability to find structure and feeling within a nearby landscape.

Yellowstone and the monumental canvas

In 1871 Moran accompanied part of Hayden’s government survey as a guest artist. William Henry Jackson’s photographs and Moran’s sketches provided different records of the journey. The artist’s colour studies were especially useful in a visual culture where photographs were not straightforward full-colour records. The survey also offered conversation, transport and access to unfamiliar sites. ^[1]

Back east, Moran developed The Grand Canyon of the Yellowstone, completed in 1872. The Interior Museum records the canvas as roughly seven feet high and twelve feet wide. Congress purchased it for $10,000 that year. The picture transformed field material into a public exhibition work with a scale and finish that could not be achieved by a portable sketch alone. ^[6]

Its arrangement gives the spectator a shaded foreground ledge and a long view towards the falls. Dark trees sharpen the brilliance of the canyon walls, while small figures provide scale. The river appears in narrow passages below. These relationships make the gorge both identifiable and dramatically ordered. Moran supplies a place from which to look, then confronts the viewer with a space that seems immense.

The painting’s connection with the national park needs its proper chronology. The Yellowstone act was signed on 1 March 1872, before the monumental canvas was finished and publicly exhibited. The completed picture cannot have been the single cause of that legislation. Moran’s expedition images belonged to a wider circulation of evidence and advocacy involving Hayden, Jackson and others. ^[7]

The expedition account follows that network in more detail. It also distinguishes the public purchase from an original commission to make the canvas. Moran undertook the journey, developed his work and promoted it before securing a congressional buyer. The masterpiece’s institutional history belongs beside the making of the picture, rather than replacing it with a simple legend of national inspiration.

The Grand Canyon and a different kind of grandeur

Moran first visited the Grand Canyon with John Wesley Powell in 1873. He was not a member of Powell’s 1869 river voyage. The later journey gave him outlines, colour notes and photographic material from which he could develop new images. The large Chasm of the Colorado followed, dated 1873–1874 by the Interior Museum. ^{[6] [1]}

The two congressional paintings were intended as companions, but their effects differ. Yellowstone focuses attention on a distant waterfall surrounded by brilliant walls. Colorado spreads it across broken terraces under a storm, with clearer air on the right. Its dark openings and partly concealed river make the landscape less easily resolved. The spectator has to assemble depth from many overlapping forms.

Contemporary reviewers recognised the challenge. Some admired Moran’s ability to make strange colours and forms credible; others doubted whether the canvas communicated the canyon’s vast scale. Clarence Cook praised particular effects of sky and mist while finding the whole picture difficult. These responses preserve a debated artwork, rather than an uninterrupted history of acclaim. ^[1]

The disagreement also reveals competing expectations. A landscape could be judged as a report about a real place, an arrangement of forms, a display of technical ability or an emotional experience. Moran’s pictures addressed all of those demands, sometimes with results that one critic praised and another questioned. Their ambition is clearer when those differences remain visible.

Green River: repeated subjects, distinct paintings

Moran repeatedly returned to the cliffs and buttes around Green River, Wyoming. The National Gallery’s Green River Cliffs, Wyoming is an oil on canvas dated 1881. Its broad composition makes the illuminated formations dominant while a smaller foreground procession gives human scale. The picture’s arrangement has to be read as an artistic selection, rather than a complete account of settlement beside the railway. ^[8]

The Amon Carter Museum’s Cliffs of Green River is a separate 1874 oil on canvas. Crystal Bridges holds Green River, Wyoming, dated 1878 and painted on panel. Similar names do not make them duplicate catalogue entries. Date, support, composition and collection distinguish works through which Moran revisited a rich subject. ^{[9] [10]}

The repeated subject allows comparison of emphasis. In one canvas, a long skyline may dominate; in another, a particular cliff can acquire more weight. Changes in the lower half affect the relation between people, water and rock. Looking at the works together shows selection in practice without requiring us to claim that each is a literal record of the same viewing station.

Green River also makes the broader history of Moran’s West tangible. Railway access, commercial travel and image-making were connected. A painted vista that suppresses industrial elements should not be accepted as evidence that the place had none. The picture’s choice of what to include is part of its meaning. Grandeur and historical selectivity can be recognised within the same image.

Holy Cross and the language of landscape

Mountain of the Holy Cross, completed in 1875 and held by the Autry, approaches grandeur through an upright valley. A stream and successive cascades lead towards a summit marked by a cross of snow. The cross is small within the canvas, yet it gives the subject a strong identity. The foreground supplies a longer, more varied path towards it. ^[11]

Moran’s correspondence records his intention to use a waterfall seen during the 1874 journey in the foreground. That specific evidence illuminates the relation between experience and composition. The artist found a feature worth observing, then decided how it could contribute to a picture. A field encounter and its eventual pictorial use were connected without being identical. ^[1]

The snow cross also invited religious meanings among nineteenth-century European American audiences. Those readings belong to the painting’s reception, rather than to a truth established by the natural formation. A landscape can become a cultural emblem through naming, arrangement and public interpretation. It does not follow that every viewer shared that meaning or that it reveals all of the artist’s personal beliefs.

Literary subjects offer another form of this relationship. Moran’s Fiercely the red sun descending takes its title from Longfellow’s The Song of Hiawatha. The North Carolina Museum of Art dates the painting 1875–1876. Its sunset connects a painted landscape with a poem, but the poem’s nineteenth-century construction should not be presented as an unmediated Indigenous account. ^[12]

Watercolours as more than field notes

Moran’s watercolours range from working records to carefully developed pictures. Their portability made paper useful on journeys, but small size does not automatically mean that a sheet was made quickly or entirely outdoors. Date, medium and function must be established for each work rather than inferred from the category alone.

The National Gallery’s Tower (Tower Falls, Yellowstone), dated 1872, is a vertical study using watercolour, gouache and graphite on blue laid paper. It concentrates on a rock formation associated with the falls, rather than presenting the whole canyon panorama. The distinction gives the sheet an interest of its own: a tall form and its surroundings can become the focus of sustained attention. ^[13]

Summit of the Sierras provides another example. The Art Institute of Chicago dates the original gouache 1872/1875. Its existence must be distinguished from the published Prang colour print of the subject. A paper original and a printed multiple can carry closely related imagery while remaining different objects with different dates and materials. ^[14]

The comparison changes how we understand Moran’s working practice. Some sheets preserve information later used elsewhere; others offer a finished encounter on paper. A transparent passage, an opaque highlight or the colour of the support can contribute in ways unlike oil paint on a large canvas. The medium was not simply a lesser version of his more famous work.

Looking across oil and paper also shows that scale was a choice. A small rock study invites close inspection; a monumental canyon asks the spectator to move between overall effect and detail. Each can organise colour and space persuasively. The value of the paper works lies partly in the different forms of attention they make possible.

Prints, publishers and audiences

Moran’s prints and drawings connect the studio with a much wider audience. Lithographs, etchings and illustrations were not all made by the same process. A wood engraving after one of his designs might involve another specialist; an etching could record marks he made on a plate. Authorship and medium need to be described with those differences in mind. ^[1]

His early engraving apprenticeship makes this aspect of his career especially significant. The practical problem of turning a design into a printed image was familiar before the western journeys. Later, scientific reports, magazines and illustrated books offered different destinations for his drawings. The same landscape could enter public life through a specialised report or a popular publication without remaining unchanged in the translation.

The National Gallery’s 1888 Mountain of the Holy Cross, Colorado uses etching, roulette and aquatint in brown on paper. It is a later work related to the oil subject, not a second completion date for the Autry canvas. Its line and tone create their own account of trees, stone, water and atmosphere. The plate’s inscriptions also preserve information about publication. ^[15]

Reproduction could increase an image’s reach, but it involved practical decisions about size, detail, tone and cost. A design that worked as a large painting would not necessarily remain equally clear on a small printed page. Moran’s professional correspondence and the catalogue’s print studies reveal an artist attentive to those decisions. His public influence was therefore partly a history of media and distribution, not just of celebrated originals.

Watch: Thomas Moran

Choose a film to explore the artist’s work, its interpretation and its wider setting.

The painting that inspired a National Park

Smarthistory

A close discussion of Moran’s landscape and its relationship to the idea of Yellowstone.

Watch on YouTube

▶01 · WatchLooking at YellowstoneSmarthistory▶02 · WatchMoran at the museumThe San Diego Museum of Art

Mary Nimmo Moran and an artistic household

Mary Nimmo Moran was an artist with a professional life of her own. She and Thomas married in 1863. Their shared household provided a setting for work, travel and family life, but her painting and etching should not be reduced to an anonymous supporting role in his career. The records distinguish her exhibited works, invitations and reputation. ^[1]

In 1881 both were invited to become Fellows of the Society of Painter-Etchers in London. Contemporary responses singled out Mary’s prints for praise. Published accounts disagree about her New York Etching Club election: the 1997 catalogue gives 1881, while the Smithsonian profile gives 1879. That unresolved difference does not diminish her separate professional recognition. ^[16]

Their subjects could overlap while their individual work remained identifiable. Long Island offered Mary gardens, orchards, ponds and nearby landmarks. The historic structure report for the East Hampton studio stresses her connection with that local setting. Reading the building’s history through both artists gives a different picture from treating it only as the retreat of a painter of the distant West. ^[17]

The family also participated in the movement of images. Thomas’s brother John photographed landscapes and drawings; later, daughters Ruth and Mary Moran Tassin accompanied him and helped preserve accounts of his career. Such activities do not make every family member a co-author of every work. They do make the notion of a completely solitary artistic life inadequate.

Mary died in 1899, after a career that deserves attention on its own terms. Moran continued to paint for decades, with changing patterns of travel and residence. The continuation of his career should not cause her earlier work to vanish into a short sentence about bereavement. The East Hampton setting preserves evidence of two artists’ practices as well as their shared domestic life.

East Hampton as a place of work

The studio was built in 1884, and the family moved in during 1885. Its principal interior was a large space intended first for art, with living accommodation arranged around and above it. The historic structure report describes reused architectural elements and later alterations. These features make the building an active expression of the Morans’ working environment. ^[17]

The grounds mattered too. Gardens, trees, neighbouring properties and nearby ponds offered subjects close to home. Travel could bring sketches from distant places, while the studio provided room to develop oils and plates. East Hampton was not simply a pause between expeditions. Local observation, family life and the completion of other subjects operated together there.

East Hampton, Long Island, a picture dated 1897, makes a useful local comparison. Its house, cattle and reflected evening light create a quieter view than the canyon canvases. The pictured building should not be identified automatically as Moran’s own studio. A painting associated with East Hampton is not a documentary photograph of every part of his property.

The East Hampton Historical Society interprets the home and studio through Thomas and Mary’s histories. That surviving site offers one way to connect the pictures with the spaces in which artistic and family work occurred. Its present-day interpretation belongs to the continuing history of the place, while historic photographs and written records supply evidence for earlier arrangements. ^[18]

The sea and Venice

Moran’s marine work places his interest in light within another kind of space. The National Gallery’s The Much Resounding Sea is dated 1884. A broad expanse of water, waves and sky creates a landscape whose movement differs from the immovable cliffs of a canyon. Reflection and atmosphere remain important, but the forms through which they appear are less stable. ^[19]

The sea had figured in his work before this mature canvas. Edward’s marine painting and Turner’s example belonged to the family’s artistic education. Moran could therefore develop a seascape through a longstanding visual interest as well as through particular travel. His western fame should not make marine subjects seem like an unexplained departure from his practice.

Venice became another recurring subject after his first visit in 1886. Buildings, boats and reflected light offered ways to bring landscape and architecture together. The Smithsonian American Art Museum’s A View of Venice is an oil dated 1891. Its vertical format gives the city and water a different balance from the broad marine canvas. ^{[20] [1]}

The National Gallery’s 1888 Venetian watercolour is a separate work. Similar subject matter does not allow its date or medium to be transferred to the Smithsonian oil. These distinctions make comparison more useful: the city can be considered through different formats and materials, rather than treated as one repeatedly reproduced object. ^[21]

Across sea and city pictures, Moran could use light to connect solid and fluid surfaces. A building offers a firm silhouette, while reflection changes its appearance below. Waves introduce another pattern of repetition and interruption. These subjects show a painter whose recurring interests could move well beyond the national-park landscapes without losing their coherence.

Shoshone Falls and later western subjects

Moran continued travelling and revisiting western subjects after the initial period of fame. Gilcrease holds the monumental Shoshone Falls on the Snake River, completed in 1900. The painting expands falling water across a broad format, with mist, rock and surrounding land contributing to the effect. It belongs to a mature career, rather than to his first Yellowstone journey. ^[22]

Smaller paper works associated with Shoshone are separate objects. The earlier watercolour and the great oil differ in date, scale and medium. A comparison can show how a subject acquires a different physical presence when developed across a much larger canvas. It should not silently make every Shoshone image a direct preparatory study for the 1900 work.

The Teton paintings offer another later group. The Metropolitan Museum dates its The Teton Range 1897. This date and identity distinguish the canvas from The Three Tetons, dated 1895 in the White House collection record. Repeated mountain subjects require the same care as the Green River works: a familiar name is not enough to establish that two images show the same object. ^[23]

In California, Point Lobos, Monterey, California, signed and dated 1912, turns to coastal trees, cliffs and breaking water. Its scale of encounter is different from the distant western panoramas. A sheltered inlet and overlapping trees bring the spectator nearer to particular forms while retaining a view of the open sea. ^[24]

The Philadelphia Museum of Art’s large Grand Canyon of the Colorado River, dated 1892 and 1908, demonstrates another kind of return: development and later reworking of a major subject. It is not the 1873–1874 Chasm. The dates preserve a career in which earlier encounters could remain productive material for much later paintings. ^[25]

Later convictions about art

Moran’s long life carried his practice into a period of changing artistic expectations. Newspaper interviews from Pasadena in 1916, transcribed in the National Gallery catalogue, preserve a strongly expressed preference for knowledge of nature and careful studio work. He objected to contemporary departures that, in his view, made paint itself too conspicuous or neglected selection. These are the opinions of an older artist defending his approach, not neutral verdicts on the movements he disliked. ^[1]

That distinction helps avoid two misleading accounts of his late career. Continued activity does not mean that he embraced every new artistic direction. Equally, his opposition to some modern work does not make each later picture identical to an early one. The dates, media and compositions still show a career with different subjects and repeated reconsideration. Public statements and visible paintings provide related but separate evidence.

His insistence on selection is particularly revealing. He wanted trees to appear convincing without requiring a leaf-by-leaf display, and he valued an effect in which the spectator attended to what the artist expressed. These comments connect with the earlier rejection of literal transcription, although they came decades later and in a different interview setting. They also resist a simple description of his art as an exercise in accumulating detail.

The relationship between detail and overall effect can be tested in the pictures. A foreground rock may invite close attention, but it also belongs to a larger mass of shadow. A tree can be intricately described while framing a distant opening. Fine observation serves an arrangement that the spectator first encounters as a whole. This makes the question of how Moran selected and organised material more useful than counting visible incidents.

The interviews do not require agreement with every criticism he made. They make his priorities available for comparison with the works. We can recognise his commitment to nature, studio concentration and expressive unity while also noticing passages that contemporary critics found crowded or insufficiently distant. His convictions explain part of the ambition; they do not place the paintings beyond discussion.

Collections, records and a changing legacy

Moran’s works are held in museums with different emphases, including the Interior Museum, National Gallery, Gilcrease, Amon Carter, Autry, Smithsonian American Art Museum, Metropolitan Museum and Philadelphia Museum of Art. Their records identify individual objects more securely than a generic biography can. They also make the range of his media, dates and subjects easier to see.

The large canyon paintings have a distinctive institutional history. Congress bought them in 1872 and 1874; they transferred to the Department of the Interior in 1950. Their public ownership reinforces their association with the nation’s landscapes. It should not be confused with a guarantee that they occupy one permanent display position or that every historic photograph records their current setting. ^[6]

Archival records add another dimension. The Smithsonian Archives of American Art’s finding aid for Moran’s papers identifies a body of material through which aspects of his career can be investigated. A finding aid describes an archive; it does not mean that every letter or ledger has been read. Object records, published interviews and specific correspondence answer different questions and need their own limits. ^[26]

His legacy also invites questions about representation. The western paintings helped make particular landscapes famous, but they selected what viewers would see and how they would see it. Survey labour, commerce, settlement and Indigenous histories cannot all be recovered from a dramatic vista. Attending to that limitation allows admiration for the painting’s skill to coexist with a fuller understanding of the world around it.

Moran’s paintings are therefore best approached through both close looking and distinctions among objects. Follow the light, compare formats and notice the different roles of water, trees and rock. Then consider what is documented about a work’s making, use and reception. That combination reveals an inventive artist whose public reputation and quieter practice continue to illuminate one another.

Frequently Asked Questions

Explore the wider art history

Explore the wider history of American artists, with portraits, landscapes and changing approaches to modern art.

Compare Moran’s landscape practice with the broader Hudson River School tradition and its expansion beyond the Hudson Valley.

References

1. Nancy K. Anderson and contributors, Thomas Moran, National Gallery of Art, 1997; targeted career essays, object entries, chronology, print study and transcribed opus list. Original archival and newspaper material cited through the catalogue was not independently read in its entirety.
2. G. W. Sheldon, American Painters, D. Appleton and Company, 1879, Moran chapter, especially printed p. 125.
3. Thomas Moran, Knowledge a Prime Requisite in Art, Brush and Pencil 12, April 1903, pp. 14–16; part of an interview.
4. National Gallery of Art, The Juniata, Evening, 1864.
5. Terra Foundation for American Art, Autumn Afternoon, the Wissahickon, 1864, object 1999.99.
6. U.S. Department of the Interior Museum, Thomas Moran and the Big Picture, current collection identities and transfer information for the two congressional canvases.
7. National Archives, Act Establishing Yellowstone National Park (1872), enrolled act of 1 March 1872 and transcript.
8. National Gallery of Art, Green River Cliffs, Wyoming, 1881.
9. Amon Carter Museum of American Art, Cliffs of Green River, 1874.
10. Crystal Bridges Museum of American Art, Green River, Wyoming, 1878.
11. Autry Museum of the American West, Mountain of the Holy Cross, 1875.
12. North Carolina Museum of Art, “Fiercely the red sun descending / Burned his way along the heavens”, 1875–1876.
13. National Gallery of Art, Tower (Tower Falls, Yellowstone), 1872.
14. Art Institute of Chicago, Summit of the Sierras, 1872/1875.
15. National Gallery of Art, Mountain of the Holy Cross, Colorado, 1888 print, 2008.115.3589.
16. Smithsonian American Art Museum, Mary Nimmo Moran, artist profile. New York membership dated 1879, differing from the 1997 catalogue chronology.
17. Robert Hefner and Richard Barons, The Studio: Historic Structure Report, Village of East Hampton, 2009; published architectural and historical excerpts.
18. East Hampton Historical Society, Thomas and Mary Nimmo Moran Home and Studio.
19. National Gallery of Art, The Much Resounding Sea, 1884.
20. Smithsonian American Art Museum, A View of Venice, 1891.
21. National Gallery of Art, Venice, 1888 watercolour.
22. Gilcrease Museum, Shoshone Falls on the Snake River, 1900.
23. Metropolitan Museum of Art, The Teton Range, 1897.
24. Wikimedia Commons, Point Lobos, Monterey, California, signed and dated 1912; faithful reproduction record associated with the White House collection.
25. Philadelphia Museum of Art, Grand Canyon of the Colorado River, 1892 and 1908.
26. Smithsonian Archives of American Art, Thomas Moran papers, archive description and finding aid.
27. Splash image source.

    Portrait of Thomas Moran, between 1890 and 1896. Napoleon Sarony / Library of Congress. Image source. No known restrictions on publication. Resized only; complete source image retained.

28. Splash image source.

    The Juniata, Evening, 1864. National Gallery of Art, Gift of Max and Heidi Berry and Ann and Mark Kington/The Kington Foundation. Image source. Public domain; NGA Open Access. Resized only; complete source image retained.

29. Splash image source.

    The Grand Canyon of the Yellowstone, 1872. Wuselig / Wikimedia Commons, CC BY-SA 4.0; U.S. Department of the Interior Museum painting. Image source. CC BY-SA 4.0; also marked PD-Art. Outer museum frame cropped; resized. Painted composition retained; photographic perspective unchanged. This image derivative is available under the same licence.

30. Splash image source.

    The Much Resounding Sea, 1884. National Gallery of Art, Gift of the Avalon Foundation. Image source. Public domain; NGA Open Access. Resized only; complete source image retained.

31. Splash image source.

    The Juniata, Evening, 1864. National Gallery of Art, Gift of Max and Heidi Berry and Ann and Mark Kington/The Kington Foundation. Image source. Public domain; NGA Open Access. Resized only; complete source image retained.

32. Splash image source.

    The Grand Canyon of the Yellowstone, 1872. Wuselig / Wikimedia Commons, CC BY-SA 4.0; U.S. Department of the Interior Museum painting. Image source. CC BY-SA 4.0; also marked PD-Art. Outer museum frame cropped; resized. Painted composition retained; photographic perspective unchanged. This image derivative is available under the same licence.

33. Splash image source.

    A View of Venice, 1891. Smithsonian American Art Museum, Transfer from the U.S. Department of the Interior, National Park Service, 1968.120.1. Image source. Free to use; Smithsonian Open Access. Resized only; complete source image retained.

34. Splash image source.

    Shoshone Falls on the Snake River, 1900. Wolfgang Sauber / Wikimedia Commons, CC BY-SA 3.0; Gilcrease Museum painting. Image source. CC BY-SA 3.0; also marked PD-Art. Resized only; complete source image retained. This image derivative is available under the same licence.

35. Splash image source.

    The Grand Canyon of the Yellowstone, 1872. Wuselig / Wikimedia Commons, CC BY-SA 4.0; U.S. Department of the Interior Museum painting. Image source. CC BY-SA 4.0; also marked PD-Art. Outer museum frame cropped; resized. Painted composition retained; photographic perspective unchanged. This image derivative is available under the same licence.

36. Splash image source.

    The Chasm of the Colorado, 1873–1874. U.S. Department of the Interior Museum; faithful reproduction via Smithsonian American Art Museum / Wikimedia Commons. Image source. Public Domain Mark; faithful two-dimensional reproduction. Resized only; complete source image retained.

37. Splash image source.

    Mountain of the Holy Cross, 1875. Autry Museum of the American West; faithful reproduction via Wikimedia Commons. Image source. Public Domain Mark; faithful two-dimensional reproduction. Resized only; complete source image retained.

38. Splash image source.

    Shoshone Falls on the Snake River, 1900. Wolfgang Sauber / Wikimedia Commons, CC BY-SA 3.0; Gilcrease Museum painting. Image source. CC BY-SA 3.0; also marked PD-Art. Resized only; complete source image retained. This image derivative is available under the same licence.

39. Splash image source.

    Green River Cliffs, Wyoming, 1881. National Gallery of Art, Gift of the Milligan and Thomson Families. Image source. Public domain; NGA Open Access. Resized only; complete source image retained.

40. Splash image source.

    A View of Venice, 1891. Smithsonian American Art Museum, Transfer from the U.S. Department of the Interior, National Park Service, 1968.120.1. Image source. Free to use; Smithsonian Open Access. Resized only; complete source image retained.

41. Splash image source.

    The Three Tetons, 1895. The White House Collection, Gift of C. R. Smith; faithful reproduction via Wikimedia Commons. Image source. Public Domain Mark; faithful reproduction of a two-dimensional public-domain work. Resized only; complete source image retained.

42. Splash image source.

    Cliffs of Green River, 1874. Amon Carter Museum of American Art, Fort Worth, Texas, 1975.28. Image source. Public domain stated on object page. Resized only; complete source image retained.

43. Splash image source.

    The Much Resounding Sea, 1884. National Gallery of Art, Gift of the Avalon Foundation. Image source. Public domain; NGA Open Access. Resized only; complete source image retained.

44. Splash image source.

    The Grand Canyon of the Yellowstone, 1872. Wuselig / Wikimedia Commons, CC BY-SA 4.0; U.S. Department of the Interior Museum painting. Image source. CC BY-SA 4.0; also marked PD-Art. Outer museum frame cropped; resized. Painted composition retained; photographic perspective unchanged. This image derivative is available under the same licence.

45. Splash image source.

    The Chasm of the Colorado, 1873–1874. U.S. Department of the Interior Museum; faithful reproduction via Smithsonian American Art Museum / Wikimedia Commons. Image source. Public Domain Mark; faithful two-dimensional reproduction. Resized only; complete source image retained.

46. Splash image source.

    Mountain of the Holy Cross, 1875. Autry Museum of the American West; faithful reproduction via Wikimedia Commons. Image source. Public Domain Mark; faithful two-dimensional reproduction. Resized only; complete source image retained.

47. Splash image source.

    Shoshone Falls on the Snake River, 1900. Wolfgang Sauber / Wikimedia Commons, CC BY-SA 3.0; Gilcrease Museum painting. Image source. CC BY-SA 3.0; also marked PD-Art. Resized only; complete source image retained. This image derivative is available under the same licence.

48. Splash image source.

    Green River Cliffs, Wyoming, 1881. National Gallery of Art, Gift of the Milligan and Thomson Families. Image source. Public domain; NGA Open Access. Resized only; complete source image retained.

49. Splash image source.

    A View of Venice, 1891. Smithsonian American Art Museum, Transfer from the U.S. Department of the Interior, National Park Service, 1968.120.1. Image source. Free to use; Smithsonian Open Access. Resized only; complete source image retained.

50. Splash image source.

    The Three Tetons, 1895. The White House Collection, Gift of C. R. Smith; faithful reproduction via Wikimedia Commons. Image source. Public Domain Mark; faithful reproduction of a two-dimensional public-domain work. Resized only; complete source image retained.

51. Kevin J. Avery, “The Hudson River School”, Metropolitan Museum of Art (2004). Origins in 1825 and decline in the 1870s–1880s; c. 1825–1880 is an approximate comparative range. Source
52. National Gallery of Art, Picturing France, p. 37: the Barbizon school between about 1830 and 1870. Source
53. Smithsonian American Art Museum, Thomas Cole: 1801–1848. Artist life dates. Source
54. Amon Carter Museum of American Art, Frederic Edwin Church: 1826–1900. Artist life dates. Source
55. National Gallery of Art, Albert Bierstadt: 1830–1902. Artist life dates. Source
56. National Gallery of Art, Thomas Moran: 1837–1926. Artist life dates. Source