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unknown - Public Domain
Gilbert Stuart Newton - Public Domain
Universal Film Manufacturing Company - Public Domain
Gage Skidmore - CC BY-SA 3.0
State Library of New South Wales collection -
US Government Printing Office - Public Domain
unknown photographer - Public Domain
Public Domain
Les biographies medicales - Public Domain
AgnosticPreachersKid - CC BY-SA 3.0
Roger McGuinn - Public Domain
Joshua Reynolds - Public Domain
JJ Georges - CC BY-SA 4.0
Lewis Wickes Hine (1874–1940) - Public Domain
Ibigelow - CC BY-SA 3.0
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Ogle, Chaloner, Sir, 1681?-1750
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unknown - Public Domain
Mitscherlich, Christoph Wilhelm, 1760-1854
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Gilbert Stuart Newton - Public Domain
Newton, Gilbert Stuart, 1794-1835
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Universal Film Manufacturing Company - Public Domain
Sargent, Lewis, 1903-1970
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Gage Skidmore - CC BY-SA 3.0
Emanuel, Kerry A., 1955-....
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Morris, Thomas, 1732?-
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Porter, Liliana, 1941-....
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State Library of New South Wales collection -
Bainton, Edgar L. (Edgar Leslie), 1880-1956
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US Government Printing Office - Public Domain
Edwards, Don, 1915-
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Schlegel, August Wilhelm von 1767-1845
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unknown photographer - Public Domain
Carroll, Harry
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Public Domain
Rinckart, Martin, 1586-1649
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Les biographies medicales - Public Domain
Robin, Ch.
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AgnosticPreachersKid - CC BY-SA 3.0
American Red Cross
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Roger McGuinn - Public Domain
McGuinn, Roger
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Joshua Reynolds - Public Domain
Halifax, George Montagu-Dunk, Earl of, 1716-1771
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JJ Georges - CC BY-SA 4.0
Hou, Xiaoxian, 1947-
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Nero, Emperor of Rome, 37-68
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unknown - Public Domain
Spies, August Vincent Theodore, 1855-1887
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Holland, Dave, 1946-....
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Pilkington, Thomas, Sir, -1691
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Stanislavsky, Konstantin, 1863-1938
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Monro, Harold, 1879-1932
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Cort, Hendrik Frans de, 1742-1810
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Frederick II, Holy Roman Emperor, 1194-1250
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Lewis Wickes Hine (1874–1940) - Public Domain
Adler, Felix, 1851-1933.
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Denning, Peter J., 1942-....
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Ibigelow - CC BY-SA 3.0
Goldstine, Herman H. (Herman Heine), 1913-2004
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Webb, Roy, 1888-1982
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unknown - Public Domain
Dahn, Félix, 1834-1912