Image from Wikimedia Commons
unknown - Public Domain
Office of Public Affairs, National Guard Bureau - Public Domain
Rob Mieremet - CC0 1.0
US Government - Public Domain
Foundation de - CC BY-SA 4.0
John Collier - Public Domain
Dnw - CC BY-SA 3.0
U.S. Government Printing Office. - Public Domain
not credited - Public Domain
Andres Tennus/Tartu Ülikool - CC BY-SA 3.0
Photographer Ulf Stråhle/SVT Bild - Public Domain
Public Domain
Louise Blangini (lithographer) - Public Domain
Stiizd - CC BY-SA 3.0
W. W. Foster - Public Domain
Image from Wikimedia Commons
unknown - Public Domain
Hoffman, Ogden, 1793-1856
Image from Wikimedia Commons
Office of Public Affairs, National Guard Bureau - Public Domain
Hammond, Creed Cheshire, 1874-1940
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Boylston, Ward Nicholas, 1749-1828
Image from Wikimedia Commons
Rob Mieremet - CC0 1.0
Pecker, Jean-Claude.
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US Government - Public Domain
LaHood, Darin, 1968-
Image from Wikimedia Commons
Foundation de - CC BY-SA 4.0
Sironi, Mario, 1885-1961
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John Collier - Public Domain
Stryker, Roy Emerson, 1893-1975
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Bonci, Alessandro, 1870-1940
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Thorild, Thomas, 1759-1808
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Powell, R. Douglas (Richard Douglas), Sir, 1842-1925
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Dnw - CC BY-SA 3.0
King, Inge, 1918-
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Numerov, B. (Boris), 1891-1941
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Cesalpino, Andrea, 1524 or 1525-1603
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Nägeli, Hans Georg, 1773-1836
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U.S. Government Printing Office. - Public Domain
Curtis, Thomas B. (Thomas Bradford), 1911-1993
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McDonald, A. W. (Angus William), 1799-1864
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Coolidge, Elizabeth Sprague, 1864-1953
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not credited - Public Domain
Elmy, Elizabeth C Wolstenholme, active 1881-1914, suffragette
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Andres Tennus/Tartu Ülikool - CC BY-SA 3.0
Taagepera, Rein
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Photographer Ulf Stråhle/SVT Bild - Public Domain
Rydbeck, Olof, 1913-1995
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Phillimore, Walter G. F. Phillimore (Walter George Frank Phillimore), Baron, 1845-1929
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Skarga, Piotr, 1536-1612
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Public Domain
Burian, Karel, 1870-1924
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Caillaux, Joseph, 1863-1944
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Elcano, Juan Sebastián de, ca 1476-1526
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Kogoj, Marij
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Louise Blangini (lithographer) - Public Domain
Blangini
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Stiizd - CC BY-SA 3.0
Cabral, Manuel del, 1907-1999
Image from Wikimedia Commons
W. W. Foster - Public Domain
Byrd, Richard Evelyn, 1860-1925
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unknown - Public Domain
Kalinnikov, Vasiliĭ, 1866-1901