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Soulé, Frank; Gihon, John H.; Nisbet, James - Public Domain
Smithsonian Institution -
Various - Public Domain
Wellcome Trust - CC BY-SA 4.0
Anon - Public Domain
'''Rastrojo - CC BY-SA 3.0
Bain - Public Domain
NASA/Johnson Space Center - Public Domain
unknown - Public Domain
Webb, William Larkin - Public Domain
Johann Jakob Haid - Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
Engraver unknown, based on a lost portrait by an unknown artist - Public Domain
OTFW - CC BY-SA 3.0
Agence Rol - CC BY-SA 4.0
user at project - Public Domain
NASA and John Bedke (STScI) - Public Domain
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Woodhead, G. Sims (German Sims), 1855-1921
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Soulé, Frank; Gihon, John H.; Nisbet, James - Public Domain
Stevenson, J. D. (Jonathan Drake), 1800-1894
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Gratz, Rebecca, 1781-1869
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Walmsley, Joshua, Sir, 1794-1871
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Smithsonian Institution -
Hawthorne, Charles Webster, 1872-1930
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Silvela, Manuel, 1781-1832
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Various - Public Domain
Masson, David, 1822-1907
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Wellcome Trust - CC BY-SA 4.0
Whitehead, Alfred North, 1861-1947
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Anon - Public Domain
Tripp, Bartlett, 1842-1911
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'''Rastrojo - CC BY-SA 3.0
Camus, Mario, 1935-....
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McCardell, Roy L. (Roy Larcom), 1870-
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Maxwell, Martha, 1831-1881
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Bain - Public Domain
Cannon, C. A. (Charles Albert), 1892-1971
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Tudor, Antony, 1909-1987
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NASA/Johnson Space Center - Public Domain
Gemini 2 (Spacecraft)
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unknown - Public Domain
Hamilton, James, 1786-1857
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Webb, William Larkin - Public Domain
Schiaparelli, G. V. (Giovanni Virginio), 1835-1910
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Cotte, Robert de 1656-1735
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Johann Jakob Haid - Public Domain
Agricola, Rodolphus, 1443?-1485
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Galliéni, Joseph Simon, 1849-1916
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Samaranch, Juan Antonio
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George Grantham Bain Collection (Library of Congress) - Public Domain
Ugarte, Manuel, 1878-1951
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unknown - Public Domain
Holker, John, 1719-1786
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Engraver unknown, based on a lost portrait by an unknown artist - Public Domain
Theyanoguin, Hendrick Peters, 1692-1755
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OTFW - CC BY-SA 3.0
Sidur, Vadim
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Agence Rol - CC BY-SA 4.0
Gondra, Manuel, 1871-1927
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user at project - Public Domain
Jacobs, Irwin Mark.
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NASA and John Bedke (STScI) - Public Domain
Doxsey, R. (Rodger)
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unknown - Public Domain
Fisher, George, 1795-1873
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Vulʹf, E. V. (Evgeniĭ Vladimirovich), 1885-1941