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US gov - Public Domain
Ziff-Davis Publishing / unidentified staff artist - Public Domain
film screenshot - Public Domain
Samuel De Wilde - Public Domain
BindlacherBerg - CC BY-SA 3.0
anonymous - CC BY-SA 3.0
not stated - Public Domain
Aaron Tycko - Public Domain
Harris & Ewing - Public Domain
uncredited - Public Domain
David Shankbone - CC BY-SA 3.0
Ctruongngoc - CC BY-SA 3.0
Toglenn - CC BY-SA 3.0
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Hamley, Edward Bruce, Sir, 1824-1893
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US gov - Public Domain
Fernós Isern, Antonio, 1895-1974
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Ziff-Davis Publishing / unidentified staff artist - Public Domain
Leinster, Murray, 1896-1975
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film screenshot - Public Domain
Mack, Helen
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Samuel De Wilde - Public Domain
Scott, Thomas, approximately 1535-1594
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Grechaninov, Aleksandr Tikhonovich
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Ericeira, Fernando de Meneses, conde da, 1614-1699
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Brown, Charles Brockden, 1771-1810
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Jordan, John, 1930-1988
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BindlacherBerg - CC BY-SA 3.0
Sayler, Diet
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Böhm, Carl, 1844-1920
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anonymous - CC BY-SA 3.0
Emmanuel, Maurice, 1862-1938
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not stated - Public Domain
Linton, W. J. (William James), 1812-1897
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Maugham, Robin, 1916-1981
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Aaron Tycko - Public Domain
Getty, George F. (George Franklin), 1855-1930
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Brush, Elijah, 1771-1813
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National Zoological Park (U.S.)
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Leonard, Elijah, 1814-1891
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Harris & Ewing - Public Domain
Post, Louis F. (Louis Freeland), 1849-1928
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Langevin, Hector, Sir, 1826-1906
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uncredited - Public Domain
Lester, Louise, 1867-1952
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David Shankbone - CC BY-SA 3.0
Bailey, Ronald.
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Nelson, Frances, Lady, 1761-1831
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Lonsdale, William Lowther, Earl of, 1787-1872
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Ctruongngoc - CC BY-SA 3.0
Navarre, Yves, 1940-1994
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Thompson, Freda, 1906-1980
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Andrus, Cecil D., 1931-
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Provenzo, Eugène F.
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Jones, Bobby, 1902-1971
Image from Wikimedia Commons
Toglenn - CC BY-SA 3.0
Hefner, Hugh M. (Hugh Marston), 1926-