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National Institute of Standards and Technology - Public Domain
U.S. Senate Historical Office - Public Domain
Photographer: William S. Warren (Boston) - Public Domain
Original uploader was Rath5 - Public Domain
unknown - Public Domain
*:File:Robert_Sapolsky.jpg - Public Domain
Rigmor Dahl Delphin - CC BY-SA 4.0
Richard Earlom Benjamin West -
not verifiable<br/> - Public Domain
Konrad Jacobs, Erlangen, Copyright is with MFO - CC BY-SA 2.0
Nv8200p - CC BY-SA 3.0
Unknown -
Mats Möller/Sforzando - CC0 1.0
The author is either Frank Foulsham (1873-1930; deceased for 86 years as of 2016) or Arthur Clive Banfield (1875-1965; deceased for 52 years as of 2016). - Public Domain
Governo De Sergipe - CC BY-SA 2.0
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National Institute of Standards and Technology - Public Domain
Briggs, Lyman J. (Lyman James), 1874-1963
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U.S. Senate Historical Office - Public Domain
Allen, James B. (James Browning), 1912-1978
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Grider, Henry, 1796-1866
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Photographer: William S. Warren (Boston) - Public Domain
Sauret, Émile, 1852-1920
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Lewis, Theodore Belden, 1843-1899
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Robinson, Edwin Arlington, 1869-1935
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Original uploader was Rath5 - Public Domain
Bénard, Émile, 1844-1929
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unknown - Public Domain
White, Eartha Mary Magdeline, 1876-1974
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Sauckel, Fritz, 1894-1946
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unknown - Public Domain
Somma, Antonio, 1809-1864
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Banach, Stefan, 1892-1945
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Anderson, Earl E., 1919-
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Zeune, Johann August, 1778-1853
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Schreiber, Liev
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*:File:Robert_Sapolsky.jpg - Public Domain
Sapolsky, Robert M.
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Rigmor Dahl Delphin - CC BY-SA 4.0
Foss, Wenche
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Richard Earlom Benjamin West -
Newton, Thomas, 1704-1782
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not verifiable<br/> - Public Domain
Jaekel, Otto
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unknown - Public Domain
Titus, Lydia Yeamans, 1866?-1929
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Konrad Jacobs, Erlangen, Copyright is with MFO - CC BY-SA 2.0
Kac, Mark
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Kyle, Thomas Barton, 1856-1915
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Nv8200p - CC BY-SA 3.0
Schiff, Stacy.
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Unknown -
Carr, Leland W. (Leland Walker), 1883-1969
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Mats Möller/Sforzando - CC0 1.0
Bucht, Gunnar, 1927-
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Wundt, Wilhelm Max, 1832-1920
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The author is either Frank Foulsham (1873-1930; deceased for 86 years as of 2016) or Arthur Clive Banfield (1875-1965; deceased for 52 years as of 2016). - Public Domain
Coyne, Joseph, 1867-1941
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Hosmer, James K. (James Kendall), 1834-1927
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Governo De Sergipe - CC BY-SA 2.0
Pires, Maria João
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Williams, Richard, Sir, 1890-1980
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Hart, E. B. (Edwin Bret), 1874-1953