Elliott & Fry, 1869 (ca), Sir Charles Lyell, Geologist, Carte de visite, Wisconsin Historical Society, LL/32885

A. Sonrel (46 School Street, Boston), 1864 (ca), Jean Louis Rodolphe Agassiz, Geologist, Carte de visite, Wisconsin Historical Society, LL/32879

Unidentified photographer / artist, 1865, Professor Pierre Jean Edouard Desor, Geologist, Carte de visite, Wisconsin Historical Society, LL/32881

Henry Ulke, 1868, Fielding B. Meek, Paleontologist, Carte de visite, Wisconsin Historical Society, LL/32883

Louis Jacques Mandé Daguerre, 1839, Fossils and Shells, Daguerreotype, Musée des arts et métiers, LL/1903

Unidentified photographer, 1845 (ca), Study of Rocks, Daguerreotype, J. Paul Getty Museum, LL/7509

Southworth & Hawes, 1850 (ca), Niagara Falls from the Canadian Side, Daguerreotype, Metropolitan Museum of Art, LL/40621

Hugh Lee Pattinson, 1840, April, Niagara Falls, Daguerreotype, whole plate, Newcastle University Library - Special Collections, LL/33473

Unidentified photographer / artist, 1845, Niagara Falls, Book page, Google Books, LL/35205

William Henry Jackson, 1870, 24 August, A noon meal in Ferdinand V. Hayden's camp of the U.& Geological Survey. Red Buttes, Wyo. Terr. [Hayden sits at far end of table in dark jacket; W. H. Jackson stands at far right.], National Archives and Records Administration, LL/1640

John Carbutt, 1869, 19 February (published), Fig. 6 ["a great valley of Syenites"], Book illustration, Google Books, LL/39515

Timothy H. O'Sullivan, 1867, Tufa Domes, Pyramid Lake, Nevada, Albumen print, American Art Museum, Smithsonian Institution, LL/7600

Timothy H. O'Sullivan, 1871, Water rhyolites, near Logan Springs, Nevada, Albumen print, Library of Congress, Prints and Photographs Division, LL/40665

Timothy H. O'Sullivan, 1871-1874 (survey), (expedition), 6. View of the Grand Canon walls, near mouth of Diamond River. From waterline to first shelf 1,500 feet; from shelf to top of table 3,500 feet. Distance from point of view to top of walls 3 miles., [Wheeler Survey, Explorations and Surveys West of the 100th Meridian], Stereocard, detail, Etherton Gallery, LL/24719

Timothy H. O'Sullivan, 1871-1874 (survey), 1872 (expedition), 15. the "Vermillion Cliff," a typical plateau edge, as seen from Jacobs Pool, Arizona. From its top, a plateau stretches to the right, and from its base another to the left. Their difference of level is 1,500 feet, and the step is too steep for scaling., [Wheeler Survey, Explorations and Surveys West of the 100th Meridian], Stereocard, detail, Etherton Gallery, LL/24737

Timothy H. O'Sullivan, 1871-1874 (survey), 1873 (expedition), 25. Camp Beauty, Canon de Chelle, walls 1,200 feet high, width of Canon at this point about one fourth of a mile., [Wheeler Survey, Explorations and Surveys West of the 100th Meridian], Stereocard, detail, Etherton Gallery, LL/24757

Timothy H. O'Sullivan, 1873, Canyon de Chelle, Walls of the Grand Canyon About 1200 Feet in Height, Albumen print, American Art Museum, Smithsonian Institution, LL/7596

Timothy H. O'Sullivan, 1871-1874 (survey), 1874 (expedition), 47. Alpine lakes and mountain scenery in the Cerro Blanco Mountains, Colorado, 13,000 feet above sea-level., [Wheeler Survey, Explorations and Surveys West of the 100th Meridian], Stereocard, detail, Etherton Gallery, LL/24801

Unidentified photographer / artist, 1870-1880, Book spines from Clarence King "Report of the Geological Exploration of the Fortieth Parallel made by order of the Secretary of War" (Washington: Government Printing Office, 1870-1880), Book spines, Donald A. Heald - Rare Books, Prints & Maps, LL/26996

William Henry Jackson, 1874, Title page for "Descriptive Catalogue of the Photographs of the United States Geological Survey of The Territories for The Years 1869 to 1873, inclusive" by W.H. Jackson (Washington: Government Printing Office, 1874), Title page, Google Books, LL/34861

William Henry Jackson, 1874, Title page for "Catalogue of Photographs of Indians, From Negatives in the Possession of the United States Geological Survey, Collected from Various Sources, and Covering a Period of Twenty-Five Years" by W.H. Jackson (Washington, 1874), Title page, Google Books, LL/34862

Unidentified photographer, 1870 (published), Coal-Beds of Rio Candiota, Rio Grande Do Sul, Book illustration, Google Books, LL/39517

Unidentified photographer, n.d., Bone Field on Talbot Hill, 10 miles from Canon City, Colo., Stereoview, Jeffrey Kraus Antique Photographics, LL/37786

Unidentified photographer, n.d., Bone Field on Talbot Hill, 10 miles from Canon City, Colo., Stereoview, detail, Jeffrey Kraus Antique Photographics, LL/37787

Unknown (French), 1850s (late), No.5 Roche qui pleure, [Foret de Fontainbleau], Stereoview, Northern Light Gallery, LL/41153

Eugène Cuvelier, 1863, Quarry at the Sands of Macherin, Metropolitan Museum of Art, LL/41162

Richebourg, 1879 (published), Photoglyph of a quarry with descriptions of layers [CarriÞre de Pierre a Batir], [Carte géologique détaillée de la France, Feuille 48.- Paris - Annexes. Perspectives Photographiques. Pl. II], Photoglyph, Northern Light Gallery, LL/41071

Richebourg, 1879 (published), Photoglyph of a quarry with descriptions of layers [CarriÞre de Pierre a Batir] (edited detail), [Carte géologique détaillée de la France, Feuille 48.- Paris - Annexes. Perspectives Photographiques. Pl. II], Photoglyph, detail, edited, Northern Light Gallery, LL/41072

Richebourg, 1879 (published), Photoglyph of a quarry with descriptions of layers [CarriÞre d'Argile Plastique], [Carte géologique détaillée de la France, Feuille 48.- Paris - Annexes. Perspectives Photographiques. Pl. III], Photoglyph, Northern Light Gallery, LL/41073

Richebourg, 1879 (published), Photoglyph of a quarry with descriptions of layers [CarriÞre d'Argile Plastique] (edited detail), [Carte géologique détaillée de la France, Feuille 48.- Paris - Annexes. Perspectives Photographiques. Pl. III], Photoglyph, detail, edited, Northern Light Gallery, LL/41074

C.H. Jones, 1887 (published), Brand's Cascade, Luray Caverns. (Drawn from a photograph by C.H. Jones), Magazine illustration, Google Books, LL/39516

Phillip H. Edgerton (b. 1824), 1864 (ca), Rock on a Pedestal of Ice, Tibet, Albumen Print, Peabody Essex Museum, LL/39757

Unidentified photographer / artist, 1859, 27 April, Two workmen in the gravel pit near the Seminary of St Acheul, 27 April 1859. The standing workman is pointing to the in situ flint, Albumen print, Bibliothèques d'Amiens Métropole, LL/36444

Unidentified photographer / artist, 1863, Mr. Prestwich shows a photograph of the flint tool "in situ", Book page, Google Books, LL/36442

Gustav Jõgermayer, 1863, Welitz Glacier, East by North from the Foot of the Umbal Glacier, Albumen print, mounted on cardboard, Albertina, LL/42239

Giorgio Sommer, 1872, 26 April (taken), Mount Vesuvius, active [L'Eruzione del Vesuvio], Photographic print, Library of Congress, Prints and Photographs Division, LL/40664

Giorgio Sommer, 1872 (taken), Mt Vesuvius erupting, Glass lantern slide, York Museums Trust, LL/40661

Unidentified photographer (Italian), 1892, [Lava fields, Italy], Albumen print, Northern Light Gallery, LL/41567

Giorgio Sommer, 1880s, Siracusa Latomie del Paradiso [Italy], Albumen print, Northern Light Gallery, LL/41566

Ledru Mauro, 1892, 19 August (or later), Etna - Eruzione 1892 - Nuovi monti. 19. Agusto [Italy], Albumen print, Northern Light Gallery, LL/41568

Ledru Mauro, 1892, 17 August, 1 p.m., Etna - Eruzione di Lave, Lapillo e Massi - Vista dal M.te Faggio ore 1 p.m. 17 Luglio 1892 [Italy], Albumen print, Northern Light Gallery, LL/41569

Ledru Mauro, 1892, 19 August (or later), Etna - Interno del 1 cratere, pressola montagnuola, 19 Agosto 1892 (italy), Albumen print, Northern Light Gallery, LL/41570

Giorgio Sommer, 1910 (created or published), Photographers on hillside photographing Mt. Etna eruption, Glass negative, Library of Congress, Prints and Photographs Division, LL/40662

William Jerome Harrison, n.d., Pouk Hill nr. Walsall, Basalt, Photographic print, Lapworth Museum of Geology, University of Birmingham, LL/40660

Marc Ferrez, Humberto Saraiva Antúnez, and José Carlos de Carvalho, 1888, Moving the Bendégo Meteorite, Albumen print, SFMOMA - San Francisco Museum of Modern Art, LL/46067

A.J. Russell, 1864-1869, Surveying under difficulties, [Photographs taken during construction of the Union Pacific Railroad], Albumen print, Yale University, Beinecke Rare Book and Manuscript Library, LL/46726

B.F. Baltzly, 1871, 14 October, [Geological Survey party in camp at Canoe River, October 14. Alfred Selwyn at centre with John Hammond (left centre) and Benjamin Baltzly (right centre)], [Geological Survey of Canada expedition of British Columbia, led by Alfred R. C. Selwyn], Albumen print, Toronto Reference Library, LL/41439

Joseph Burr Tyrell (1858-1957), 1893, 8 June, Grand Rapids Sandstone, underlain by Clearwater shale [on the Athabasca River], [1893 expedition to the barren lands [Geological Survey]], Black and white print, University of Toronto, Thomas Fisher Rare Book Library, LL/41413

Dr. Mandeville Thum, 1877 (Entered into Congress), [Exterior view of Mammoth Cave], [Views of Mammoth Cave and Vicinity], Stereoview, Northern Light Gallery, LL/41149

Dr. Mandeville Thum, 1877 (Entered into Congress), [Interior view of Mammoth Cave - Magnesium light], [Views of Mammoth Cave and Vicinity], Stereoview, Northern Light Gallery, LL/41150

Dr. Mandeville Thum, 1877 (Entered into Congress), [Interior view of Mammoth Cave - Magnesium light], [Views of Mammoth Cave and Vicinity], Stereoview, Northern Light Gallery, LL/41151

John A. Mather, 1876, Niagara Farm, [Titusville, Pennsylvania], Albumen print, Northern Light Gallery, LL/41152

Thomas Annan, 1874, 31 March (meeting), Photographs of fossils by Thomas Annan, Magazine page, Google Books, LL/42617

Dr. Hannes Grobe, 2005, 7 April, Fluorescent minerals, Under UV-A, UV-B and UV-C light, Creative Commons - Wikipedia, LL/42349

Dr. Hannes Grobe, 2005, 7 April, Fluorescent minerals [key], Under UV-A, UV-B and UV-C light, Creative Commons - Wikipedia, LL/42350