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New York Times - Public Domain
Randvf - CC BY-SA 3.0
EikeFA - CC BY-SA 3.0
unknown - Public Domain
unknown -
Ragesoss - CC BY-SA 3.0
Grand Canyon NPS - CC BY 2.0
George Grantham Bain Collection (Library of Congress) - Public Domain
Bertrand - CC BY 2.0
Public Domain
Perry, William Stevens - Public Domain
BRERETON GREENHOUS - Public Domain
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New York Times - Public Domain
Fisk, Harvey E. (Harvey Edward), 1856-1944
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Randvf - CC BY-SA 3.0
Fergusson, William, 1773-1846
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EikeFA - CC BY-SA 3.0
Anderson, Wilhelm, 1880-1940
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unknown - Public Domain
Harvey, William H. (William Henry), 1811-1866
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unknown -
Hollein, Hans, 1934-....
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Silfverstolpe, Malla, 1782-1861
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Tubman, William V. S., 1895-1971
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Lewis, Diana, 1919-1997
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Staughton, William, 1770-1829
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Ragesoss - CC BY-SA 3.0
Bowler, Peter J.
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Thorne, Kip S.
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Grand Canyon NPS - CC BY 2.0
Naqavoy'ma, 1900-1986
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George Grantham Bain Collection (Library of Congress) - Public Domain
Nungesser, Charles, 1892-1927
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Bertrand - CC BY 2.0
Chesnutt, Vic
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Ohsawa, Georges, 1893-1966
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Public Domain
Franchère, Gabriel, 1786-1863
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Durand, Henry Marion, Sir, 1812-1871
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Perry, William Stevens - Public Domain
Whittle, Francis McNeece, 1823-1902
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Kirke, Percy, 1646?-1691
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Roubiliac, Louis François (English sculptor, 1695-1762)
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Crowninshield, Frank, 1872-1947
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Kerschensteiner, Georg, 1854-1932
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Fairbanks, Douglas, 1883-1939
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Sydenham, Thomas, 1624-1689
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unknown - Public Domain
Lyte, Henry Francis, 1793-1847
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Tolón, Miguel Teurbe, 1820-1857
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Terry, Alice, 1899-
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Burleson, Omar Truman, 1906-1991
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BRERETON GREENHOUS - Public Domain
Collishaw, Raymond, 1893-1976
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Herlihy, Ed