Image from Wikimedia Commons
Public Domain
Anonymous - Public Domain
The Department of State, Washington, DC. - Public Domain
BKP - CC BY-SA 3.0
Randall - Public Domain
Kim Traynor - CC BY-SA 3.0
Thomas Hudson - Public Domain
Unknown - but from more than 100 years ago - Public Domain
unknown - Public Domain
DrGoon - CC BY-SA 3.0
Wilhelm Fechner (1835-1909) [http://www.fotorevers.eu/katalog1.php?details=2522] - Public Domain
Richard Budd - Public Domain
U.S. Navy - Public Domain
:w:Nobel Foundation - Public Domain
:en:United States Court of Appeals for the Ninth Circuit - Public Domain
Unknown; scanned by 天竺鼠 - Public Domain
Nihonjoe -
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Gabriel de Borbón, Infante of Spain, 1752-1788
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Boylesve, René, 1867-1926
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Public Domain
Núñez de Arce, Gaspar, 1834-1903
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Anonymous - Public Domain
Driscoll, Clara, 1861-1944
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The Department of State, Washington, DC. - Public Domain
Keïta, Salif, 1949-
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Goodall, Joseph, 1760-1840
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BKP - CC BY-SA 3.0
Steele, Tommy.
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Randall - Public Domain
Brewster, Chauncey B. (Chauncey Bunce), 1848-1941
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Kim Traynor - CC BY-SA 3.0
Halkett, Anne, Lady, 1622-1699
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Châtelet, Claude-Louis, 1753-1795
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Duff, Alexander, 1806-1878
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Thomas Hudson - Public Domain
Cibber, Susannah Maria Arne, 1714-1766
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Dirac, P.A.M. (Paul Adrien Maurice), 1902-1984
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Kneser, Adolf, 1862-1930
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Unknown - but from more than 100 years ago - Public Domain
Pise, Charles Constantine, 1801-1866
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unknown - Public Domain
Harding, G. Lankester (Gerald Lankester), 1901-
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Lawrence, Lillian, 1868-1926
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DrGoon - CC BY-SA 3.0
Collins, Simon
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Wilhelm Fechner (1835-1909) [http://www.fotorevers.eu/katalog1.php?details=2522] - Public Domain
Baginsky, A. (Adolf), 1843-1918
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Richard Budd - Public Domain
Hawker, Robert Stephen, 1803?-1875
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Avalon, Frankie
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Walker, Thomas Holmes
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U.S. Navy - Public Domain
Richardson, James O. (James Otto), 1878-1974
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Mead, John A., 1841-1920
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:w:Nobel Foundation - Public Domain
Alvarez, Luis W., 1911-1988
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Burnquist, J. A. A. (Joseph Alfred Arner), 1879-1961
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Montagu of Beaulieu, Edward John Barrington Douglas-Scott-Montagu, Baron, 1926-
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:en:United States Court of Appeals for the Ninth Circuit - Public Domain
Bernal, Jesus G., 1963-
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Unknown; scanned by 天竺鼠 - Public Domain
Zhang, Fakui, 1896-1980
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Nihonjoe -
Chamberlin, Ann