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Public Domain
Fotopersbureau De Boer - CC0 1.0
unknown -
https://www.flickr.com/photos/mtaphotos/ - CC BY 2.0
Louise Palanker - CC BY-SA 2.0
not credted - Public Domain
SFS Communications - CC BY 2.0
unknown - Public Domain
:de:Emil Tesch - Public Domain
N. MacVicar, National Institutes of Health - Public Domain
US Government Printing Office - Public Domain
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Public Domain
Hinkler, Bert, 1892-1933
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Bodley, R. V. C. (Ronald Victor Courtenay), 1892-
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Weiss, W. H. (Willoughby Hunter), 1820-1867
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Fotopersbureau De Boer - CC0 1.0
Dudok, Willem Marinus, 1884-1974
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Cathcart, George, Sir, 1794-1854
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unknown -
Gowing, Margaret
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https://www.flickr.com/photos/mtaphotos/ - CC BY 2.0
Espaillat, Adriano, 1954-
Image from Wikimedia Commons
Young, John, 1811-1878
Image from Wikimedia Commons
Louise Palanker - CC BY-SA 2.0
Marshall, Garry
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not credted - Public Domain
Friese, Richard, 1854-1918
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Dubois, Paul, 1829-1905
Image from Wikimedia Commons
SFS Communications - CC BY 2.0
Sorvino, Mira
Image from Wikimedia Commons
unknown - Public Domain
Tarr, Ralph S. (Ralph Stockman), 1864-1912
Image from Wikimedia Commons
:de:Emil Tesch - Public Domain
Abbe, Ernst, 1840-1905
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unknown - Public Domain
Mozley, J.B. (James Bowling), 1813-1878
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Ulam, Stanislaw M.
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Taliaferro, Mabel, 1889-1979
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N. MacVicar, National Institutes of Health - Public Domain
Matthaei, Heinrich.
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Darton, Nelson Horatio, 1865-1948
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US Government Printing Office - Public Domain
Watson, Albert William, 1922-1994
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Schindler, Anton, 1795-1864
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Diego, Gerardo, 1896-1987
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Addonizio, Hugh J., 1914-1981
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Vancouver, George, 1757-1798
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Cram, Ralph Adams, 1863-1942
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Ellis, George Edward, 1814-1894
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Palmgren, Alvar, 1880-1960
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Stahel, Julius, 1825-1912
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Parris, Virgil, 1807-1874
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Forrest, Theodosius, 1728-1784