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Alberto Terrile - CC BY-SA 3.0
Public Domain
Credited at source website, United States House of Representatives as:<br />Image, Office of the Clerk, U.S. House of Representatives - Public Domain
Fuzheado - CC0 1.0
Cuney-Hare, Maud, 1874-1936 - Public Domain
Unidentified (Ensian published by University of Michigan) - Public Domain
United States Senate Historical Office - Public Domain
David Shay - CC BY-SA 2.5
Lioneldecoster - CC BY-SA 3.0
Carlton E. Sanford, author. The Bartlett Press (Boston, MA), publisher. - Public Domain
Antonio de Sancha , 1774 apud Pascual Pedro Moles (1741-1797), dibujo de Charles de La Traverse(1726-1780) - Public Domain
Gryffindor - CC BY-SA 3.0
GFHund - CC BY 3.0
[http://www.astro.uu.nl/~rutten/Rob_s_astronomer_shots.html] - CC BY-SA 3.0
Macfadden Publications - Public Domain
Perry, William Stevens - Public Domain
Giuseppe Molteni - Public Domain
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Alberto Terrile - CC BY-SA 3.0
Kieślowski, Krzysztof, 1941-1996
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Public Domain
Tomlin, John Read le Brockton, 1864-1954
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Credited at source website, United States House of Representatives as:<br />Image, Office of the Clerk, U.S. House of Representatives - Public Domain
Ryan, Leo J.
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Fuzheado - CC0 1.0
Bunch, Lonnie G. III, 1952-
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Cuney-Hare, Maud, 1874-1936 - Public Domain
Cuney-Hare, Maud, 1874-1936
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Public Domain
Kearny, Philip, 1815-1862
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Mosse, Albert, 1846-1925
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Unidentified (Ensian published by University of Michigan) - Public Domain
Piaget, Jean, 1896-1980
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United States Senate Historical Office - Public Domain
Walker, Freeman, 1780-1827
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Crain, William Henry, 1848-1896
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David Shay - CC BY-SA 2.5
Averbuch, Ilan, 1953-....
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Lioneldecoster - CC BY-SA 3.0
Mabon, Willie, 1925-1985
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Carlton E. Sanford, author. The Bartlett Press (Boston, MA), publisher. - Public Domain
Sanford, Jonah, 1790-1867
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Antonio de Sancha , 1774 apud Pascual Pedro Moles (1741-1797), dibujo de Charles de La Traverse(1726-1780) - Public Domain
Villegas, Esteban Manuel de 1589-1669
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Clancarty, Richard Le Poer Trench, Earl of, 1767-1837.
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Gryffindor - CC BY-SA 3.0
Oheka (Cold Spring Harbor, N.Y.)
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GFHund - CC BY 3.0
Minkowski, Rudolf 1895-1976
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Devrient, Eduard, 1801-1877
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Leslie, Joan, 1925-....
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Nils-Udo, 1937-....
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[http://www.astro.uu.nl/~rutten/Rob_s_astronomer_shots.html] - CC BY-SA 3.0
Hulst, H. C. van de (Hendrik Christoffel), 1918-
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Macfadden Publications - Public Domain
Block, Martin, 1903-1967
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Perry, William Stevens - Public Domain
Whittle, Francis McNeece, 1823-1902
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Isabella d'Este, consort of Francesco II Gonzaga, Marquis of Mantua, 1474-1539
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Ursúa, Pedro de, 1526-1561
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Pilsbry, Henry Augustus, 1862-
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Westmacott, Richard, Sir, 1775-1856
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Giuseppe Molteni - Public Domain
Migliara, Giovanni, 1785-1837
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Darling, Samuel T. (Samuel Taylor), 1872-1925
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Aĭtmatov, Chingiz