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Caricologist - CC BY-SA 3.0
Storms, A. D.- - Public Domain
unknown - Public Domain
jenniferrt66 - CC BY-SA 2.0
Wikipedia:Lothar Wolleh -
NBC Television - Public Domain
Heike Zappe -
Unknown photographer of the Signal Corps - Public Domain
Siebe van Ineveld - CC BY-SA 2.0
Jahresbericht der Deutschen Mathematiker-Vereinigung 1915 - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
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Blanco, Andrés Eloy (1898-1955).
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Caricologist - CC BY-SA 3.0
Howell, John Thomas, 1903-1994
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Storms, A. D.- - Public Domain
Kendall, Ezra, 1861-1910
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Maillart, Ella Katherine, 1903-1997
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Lyttelton, Edward
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De Feuillide, Eliza
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unknown - Public Domain
Ćopić, Vladimir 1891-1939
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jenniferrt66 - CC BY-SA 2.0
Buzzi, Ruth 1936-....
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Wikipedia:Lothar Wolleh -
Fontana, Lucio, 1899-1968
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Nisargadatta, maharaj, 1897-1981
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Gilpin, Charles S. (Charles Sidney), 1878-1930
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Forbes, James David, 1809-1868
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McGuire, Dorothy, 1918-2001
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NBC Television - Public Domain
Bregman, Buddy
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Heike Zappe -
Berggruen, Heinz
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Cambry, Jacques, 1749-1807
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Unknown photographer of the Signal Corps - Public Domain
McCaul, V. J. (Verne James), 1903-1968
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Marshall, Herbert, 1890-1966
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Scheidemann, Heinrich, approximately 1595-1663
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Eeckhout, Gerbrand van den 1621-1674
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Voisenon, Claude-Henri de Fusée de, 1708-1775
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De la Gardie, Magnus Gabriel, greve, 1622-1686
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unknown - Public Domain
Lucas, John B. C. (John Baptiste Charles), -1842
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Siebe van Ineveld - CC BY-SA 2.0
Douglas, Dave
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Jahresbericht der Deutschen Mathematiker-Vereinigung 1915 - Public Domain
Burkhardt, Heinrich, 1861-1914
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Mathew Brady Levin Corot Handy - Public Domain
Booth, Newton, 1825-1892
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Neville, Wendell Cushing, 1870-1930
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Müller, Lauro 1863-1926
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unknown - Public Domain
Angell, Truman O. (Truman Osborn), 1810-1887
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Browne, Frances, 1816-1879