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author - Public Domain
Juan de Valdés Leal - Public Domain
Daniel A. Payne - Public Domain
Public Domain
unknown - Public Domain
NBC - Public Domain
AcademiadeMedicina - CC BY-SA 4.0
Tille & Opitz - Public Domain
B. Frank Saylor -
Steve02476 - CC BY-SA 3.0
Unattributed - Public Domain
openingminds - CC BY 2.0
Colmer, Montagu, and Charles Erskine Scott Wood - Public Domain
http://www1.appstate.edu/~kms/classes/psy3202/images/ClarkHull2.jpg -
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author - Public Domain
Jones, Samuel, 1819-1887
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Morrison, H. C. (Henry Clay), 1857-1942
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Juan de Valdés Leal - Public Domain
Valdés Leal, Juan de, 1622-1690
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Revier, Dorothy
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Daniel A. Payne - Public Domain
Allen, Richard, 1760-1831
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Public Domain
Bagford, John, 1650-1716
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unknown - Public Domain
Davis, Henry William Banks 1833-1914
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NBC - Public Domain
Fabray, Nanette
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Card, Charles Ora, 1839-1906
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Public Domain
Fairchild, Muir Stephen, 1894-1950
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AcademiadeMedicina - CC BY-SA 4.0
Anthony, E. James (Elwyn James), 1916-
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Corbett, James J., 1866-1933
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Albaladejo, Pierre
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Egerton, John, 1721-1787
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Moore, George Fletcher, 1798-1886
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Bauernfeind, Gustav, 1848-1904
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Gell-Mann, Murray
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unknown - Public Domain
French, George Arthur, 1841-1921
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Tille & Opitz - Public Domain
Bevignani, Enrico, 1841-1903
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B. Frank Saylor -
Atlee, John L. (John Light), 1799-1885
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Portman, Rob, 1955-
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Steve02476 - CC BY-SA 3.0
Leblanc, Steven A.
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unknown - Public Domain
McCay, Winsor
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Unattributed - Public Domain
Serpette, Gaston, 1846-1904
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Elliott, R. D. (Robert Charles Dunlop), 1884-1950.
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openingminds - CC BY 2.0
Schoenberg, Loren, 1958-
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Colmer, Montagu, and Charles Erskine Scott Wood - Public Domain
Wood, Charles Erskine Scott, 1852-1944
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Daugherty, H. M. (Harry Micajah), 1860-1941
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unknown - Public Domain
Bortnowski, Władysław, 1891-1966
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http://www1.appstate.edu/~kms/classes/psy3202/images/ClarkHull2.jpg -
Hull, Clark Leonard, 1884-1952