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Geo (George) W. Wanless - Public Domain
Antonio Martechini - Public Domain
Field Artillery Central Officers Training School Association, authors. Knickerbocker Press (New York, NY), publisher. - Public Domain
Lia Chang - CC BY-SA 2.0
Letoline - CC BY-SA 3.0
Public Domain
U.S. Mission Photos by Eric Bridiers - Public Domain
Aaron Fulkerson - CC BY-SA 2.0
World Telegram staff photographer - Public Domain
Paul Ekman Group, LLC - CC BY-SA 3.0
Internet Archive Book Images -
Edward Harold Mott - Public Domain
Bain News Service, publisher - Public Domain
GFHund - CC BY 3.0
unknown - CC BY 4.0
unknown - Public Domain
Ross Burgess - CC BY-SA 3.0
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McMullen, Sean, 1948-....
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Hanway, Jonas, 1712-1786
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Geo (George) W. Wanless - Public Domain
Wanless, W. J. (William James), Sir, 1865-1933
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Antonio Martechini - Public Domain
Gradić, Stjepan, 1613-1683
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Fiorilli, Tiberio, 1608-1694
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Field Artillery Central Officers Training School Association, authors. Knickerbocker Press (New York, NY), publisher. - Public Domain
Goodyear, A. Conger (Anson Conger), 1877-1964
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Lia Chang - CC BY-SA 2.0
Gotanda, Philip Kan
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Barnes, Robert, 1817-1907
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Letoline - CC BY-SA 3.0
Kogan, Pavel, 1952-
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Public Domain
Donnell, Forrest C., 1884-1980
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Henrick, Richard P.
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U.S. Mission Photos by Eric Bridiers - Public Domain
Forsythe, William, 1949-....
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Aaron Fulkerson - CC BY-SA 2.0
Tufte, Edward R., 1942-....
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World Telegram staff photographer - Public Domain
Vavilov, N. I. (Nikolaĭ Ivanovich), 1887-1943
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Paul Ekman Group, LLC - CC BY-SA 3.0
Ekman, Paul.
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Calonne, Charles-Alexandre de, 1734-1802
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Internet Archive Book Images -
Colbert, Edwin H. (Edwin Harris), 1905-2001
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Public Domain
Brooks, Noah, 1830-1903
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Edward Harold Mott - Public Domain
Jewett, Hugh J. (Hugh Judge), 1817-1898
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Bain News Service, publisher - Public Domain
Coulter, John B. (John Breitling), 1891-1983
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Sullivan, Maxine, 1911-1987
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GFHund - CC BY 3.0
Amaldi, Edoardo
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Klügel, Georg Simon, 1739-1812
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Rawlins, Joseph L. (Joseph Lafayette), 1850-1926
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Cima da Conegliano, Giovanni Battista, approximately 1459-1517 or 1518
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Schuster, Arthur, Sir, 1851-1934
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unknown - CC BY 4.0
Alcock, A. (Alfred), 1859-1933
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unknown - Public Domain
McAllister, Addams S. (Addams Stratton), 1875-1946
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Haworth, Adrian Hardy, 1768-1833
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Ross Burgess - CC BY-SA 3.0
Gosling, Ray, 1939-2013