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U.S. Army Signal Corps - Public Domain
GhostPirat - Public Domain
unknown - Public Domain
unknown -
Jean-Baptiste Descamps - Public Domain
anonymous - Public Domain
Saddhiyama - Public Domain
Michael Bednarek - CC BY-SA 4.0
Public Domain
"The World's Work" magazine. Photo by Harris & Ewing (Washington, DC). - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
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Ferguson, James Edward, 1871-1944
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U.S. Army Signal Corps - Public Domain
Woodruff, Roscoe B. (Roscoe Barnett), 1891-1975
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Hamilton, Robert, 1743-1829
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Boggs, Charles Stuart, 1811-1888
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GhostPirat - Public Domain
Perrin, Abner M., 1827-1864
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Holten, Katie
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unknown - Public Domain
Taylor, Bayard, 1825-1878
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Fox, Wilson, 1831-1887
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Rehn, Elisabeth, 1935-
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unknown - Public Domain
Caro Rodríguez, José María (1866-1958).
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unknown -
Jespersen, Otto, 1860-1943
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Alexander, Grand Duke of Vladimir, 1220-1263
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Jean-Baptiste Descamps - Public Domain
Brandmuller, Gregor
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anonymous - Public Domain
Parker, Charles W. (Charles Wolcott), 1862-1948
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MacNab, Allan Napier, 1798-1862
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Lissitzky, El, 1890-1941
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Quigg, Chris.
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Saddhiyama - Public Domain
Molbech, Christian, 1783-1857
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Robards, Jason
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unknown - Public Domain
Rosati, Joseph, 1789-1843
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Willoughby, Charles Andrew, 1892-1972
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Michael Bednarek - CC BY-SA 4.0
Rhode, Robin
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Pratt, Bela Lyon, 1867-1917
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Public Domain
Still, William, 1821-1902
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Leacock, Stephen, 1869-1944
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"The World's Work" magazine. Photo by Harris & Ewing (Washington, DC). - Public Domain
Wright, William Mason, 1863-1943
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Cooper, Thomas Sidney, 1803-1902
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Culver, John C., 1932-....
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Mathew Brady Levin Corot Handy - Public Domain
Errett, Russell
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unknown - Public Domain
Allen, Harrison, 1841-1897