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National Endowment for the Arts - Public Domain
unknown - Public Domain
Henry L. Chase - Public Domain
Unknown (published by Hall, Virtue, and Co, 1849) - Public Domain
Klemens Ammon - Public Domain
Vandor - Public Domain
Mathew Brady - Public Domain
United States Congress - Public Domain
Lupin le vorace - CC BY-SA 2.0
Mathew Brady Levin Corot Handy - Public Domain
Henry Maull (1829–1914) and John Fox (1832–1907) - Public Domain
George Danor - Public Domain
Mrkhlopov - CC BY-SA 4.0
CactusWriter - CC BY-SA 3.0
Anonymous (photographer) -
Wm. Notman & Son - Public Domain
L. Perini - Public Domain
Michael Fiegle - Public Domain
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Zhang, Junmai, 1886-1969
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National Endowment for the Arts - Public Domain
Ward, Robert, 1917-2013
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Geoffrin, Marie-Thérèse Rodet, 1699-1777
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unknown - Public Domain
Sedita, Frank A. (Frank Albert), 1907-1975
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Henry L. Chase - Public Domain
Ii, John Papa
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Unknown (published by Hall, Virtue, and Co, 1849) - Public Domain
Barton, Bernard, 1784-1849
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Klemens Ammon - Public Domain
Oecolampadius, Johann, 1482-1531
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Vandor - Public Domain
Short, Frank H. (Frank Hamilton), 1862-1920
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Mathew Brady - Public Domain
Elam, Joseph Barton, 1821-1885
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United States Congress - Public Domain
Hartke, Vance
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Virginia Tech
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Lupin le vorace - CC BY-SA 2.0
Nahon, Philippe, 1938-....
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Howard, Sidney Coe, 1891-1939
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Mathew Brady Levin Corot Handy - Public Domain
Plumb, Preston B., 1837-1891
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Baines, Matthew Talbot, 1799-1860
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Vancouver, George, 1757-1798
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Henry Maull (1829–1914) and John Fox (1832–1907) - Public Domain
Scott, Robert Falcon, 1868-1912
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Denza, Francesco, 1834-1894
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George Danor - Public Domain
Rosenwald, Lessing J. Lessing Julius 1891-1979
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Mrkhlopov - CC BY-SA 4.0
Lawrence-King, Andrew
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Mathew Brady Levin Corot Handy - Public Domain
Bishop, Richard M., 1812-1890
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Maton, William George, 1774-1835
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CactusWriter - CC BY-SA 3.0
Keane, Bil, 1922-2011
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Anonymous (photographer) -
Domela, 1900-1992
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Mathew Brady - Public Domain
Miles, William Porcher, 1822-1899
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Edelsbrunner, Herbert.
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Wm. Notman & Son - Public Domain
Gault, Andrew Hamilton, 1882-1958
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Campagnoli, Bartolomeo, 1751-1827
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L. Perini - Public Domain
Gully, James Manby, 1808-1883
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Michael Fiegle - Public Domain
Berlepsch, Hans Hermann Carl Ludwig, Graf von, 1850-1915