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Kent State University -
unknown - Public Domain
Josef Kriehuber - Public Domain
National Geographic Society - Public Domain
Natalia Dobryszycka - CC BY 2.0
Public Domain
REUVEN FRIZI - CC BY-SA 3.0
Elliott & Fry - Public Domain
Toglenn - CC BY-SA 3.0
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Kent State University -
Lewis, Robert, 1909-1997
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unknown - Public Domain
Altamirano, Ignacio Manuel, 1834-1893
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Thomas, Jameson, 1888-1939
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Sires, Albio, 1951-
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Josef Kriehuber - Public Domain
Fürstenau, Anton Bernhard, 1792-1852
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Johanson, Chris, 1968-....
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Lanham, Samuel W. T. (Samuel Willis Tucker), 1846-1908
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Eaton, Daniel Cady, 1834-1895
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Loriot, 1923-2011
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Day, Sherman, 1806-1884
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Derwentwater, James Radcliffe, Earl of, 1689-1716
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Sorlie, Arthur, 1874-1928
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National Geographic Society - Public Domain
Tittmann, O. H. (Otto Hilgard), 1850-1938
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Nicholson, Seth B. (Seth Barnes), 1891-1963
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Natalia Dobryszycka - CC BY 2.0
Swallow, Steve
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Paolini, Marco
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Lee, T. D., 1926-
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Public Domain
Pollock, Edwin T. (Edwin Taylor), 1870-1943
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unknown - Public Domain
McVey, Patrick, 1910-1973
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Waterman, Waldo Dean, 1894-1976
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REUVEN FRIZI - CC BY-SA 3.0
Gabay, Sasson
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Beard, John, 1715 or 1716-1791
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Ryan, Robert, 1909-1973
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Elliott & Fry - Public Domain
Johnston, Harry, 1858-1927
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Royal, F. B. (Forrest Betton), 1893-1945
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Diaz de la Peña, Narcisse Virgile, 1807-1876
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McGuire, Bird S. (Bird Segle), 1865-
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Lang, Fritz, 1890-1976
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Toglenn - CC BY-SA 3.0
Siffredi, Rocco, 1964-....
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unknown - Public Domain
Rothman, Steven R. (Steven Richard), 1952-