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unknown - Public Domain
Rob McAlear - Public Domain
Lost&Fool - CC BY-SA 3.0
Public Domain
Dr. C. George Boeree -
Tom Marcello - CC BY-SA 2.0
Eugène Verboeckhoven - Public Domain
ÑuÑuX - CC BY-SA 4.0
original uploader - CC BY 2.5
US Gov - Public Domain
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unknown - Public Domain
Ball, Joseph H. (Joseph Hurst), 1905-1993
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Winn, Larry, 1919-
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Rob McAlear - Public Domain
Estacio, John, 1966-
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Lower, Mark Antony, 1813-1876
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Glynn, Robert, 1719-1800
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Cori, C. F. (Carl Ferdinand), 1896-1984
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Owen, Orville Ward, 1854-1924
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Belmont, François Vachon de, 1645-1732
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Sargent, John G. (John Garibaldi), 1860-1939
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Lost&Fool - CC BY-SA 3.0
Salgueiro, Teresa, 1969-
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Ricci, Luigi, 1805-1859
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Stephan, Alexander, 1946-2009
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Lederman, Leon M.
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Public Domain
Worthington, Henry Rossiter, 1817-1880
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Public Domain
Olin, William M., 1845-1911
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Halloran, Laurence Hynes, 1766-1831
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Dr. C. George Boeree -
Allport, Gordon W. (Gordon Willard), 1897-1967
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Corbetta, Francesco, approximately 1615-1681
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Ricks, Thomas E. (Thomas Edwin), 1828-1901
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Public Domain
Salazar, José Inés, -1917
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Tom Marcello - CC BY-SA 2.0
Vick, Harold, 1936-1987
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Chapelain, Jean, 1595-1674
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Eugène Verboeckhoven - Public Domain
Schelfhout, Andreas, 1787-1870
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ÑuÑuX - CC BY-SA 4.0
Varona, Enrique José, 1849-1933
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unknown - Public Domain
Hurwitz, Adolf, 1859-1919
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original uploader - CC BY 2.5
McGhee, Brownie, 1915-1996
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Xu, Guanjie, 1948-
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US Gov - Public Domain
Adams, Brock, 1927-2004
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Taylor, Telford, 1908-1998
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unknown - Public Domain
Wilson, Frederick