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Unknown<br/> - Public Domain
Lorens Pasch the Elder - Public Domain
Gage Skidmore - CC BY-SA 3.0
unknown - Public Domain
Unknown (Bain News Service, publisher) - Public Domain
Gert-Martin Greuel - CC BY-SA 2.0
anonymous - Public Domain
Fotograf im Auftrag der :de:United States Information Agency - Public Domain
Gage Skidmore - CC BY-SA 2.0
http://www1.appstate.edu/~kms/classes/psy3202/images/ClarkHull2.jpg -
author - Public Domain
U.S. Army photo - Public Domain
United States Congress - Public Domain
Bain - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Caricologist - CC BY-SA 3.0
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Unknown<br/> - Public Domain
Brown, Paul, 1908-1991
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Hawkins, Alvin, 1821-1905.
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Biseo, Cesare, 1843-1909
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MacMichael, H. A. (Harold Alfred), 1882-1969
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Lorens Pasch the Elder - Public Domain
Gyllenborg, Carl, greve, 1679-1746
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Gage Skidmore - CC BY-SA 3.0
Fancher, Hampton
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unknown - Public Domain
Sully, Thomas, 1783-1872
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Unknown (Bain News Service, publisher) - Public Domain
Doumer, Paul, 1857-1932
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Gert-Martin Greuel - CC BY-SA 2.0
Milnor, John W. (John Willard), 1931-
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anonymous - Public Domain
Edwards, Julian
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unknown - Public Domain
Colbert, Jacques-Nicolas, 1655-1707
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Pearce, Samuel, 1766-1799
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Orlando, Vittorio Emanuele, 1860-1952
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Fotograf im Auftrag der :de:United States Information Agency - Public Domain
Patzak, Julius
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Gage Skidmore - CC BY-SA 2.0
Ware, Hannah, 1982-
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http://www1.appstate.edu/~kms/classes/psy3202/images/ClarkHull2.jpg -
Hull, Clark Leonard, 1884-1952
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Aston, Tilly, 1873-
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author - Public Domain
Cushman, Francis W., 1867-1909
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Haverly, Jack, 1837-1901
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Guerrini, Olindo, 1845-1916
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Hellmayr, C. E. (Carl Eduard)
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Blackburn, George L., 1936-....
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U.S. Army photo - Public Domain
Davidson, Garrison H., 1904-
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United States Congress - Public Domain
Ramstad, Jim, 1946-
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Urey, Harold Clayton, 1893-
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unknown - Public Domain
Rinck, Henri, 1870-1952
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Bain - Public Domain
Anderson, George Weston, 1861-1938
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Mathew Brady Levin Corot Handy - Public Domain
Johnston, John W. (John Warfield), 1818-1889
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Caricologist - CC BY-SA 3.0
Howell, John Thomas, 1903-1994
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Parkes, Samuel, 1759-1825