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unknown - Public Domain
Billmckern - Public Domain
Library of Congress Prints and Photographs Division - Public Domain
http://www.bibl.u-szeged.hu/sztegy/photo/778.jpg - CC BY-SA 3.0
David Shankbone - CC BY-SA 3.0
Sumon07 - CC BY-SA 4.0
Al Aumuller, World Telegram staff photographer - Public Domain
'''IVIC''' (Instituto Venezolano de Investigaciones Científicas) -
no name - Public Domain
MC2 Erica R. Gardner, USN - Public Domain
Glyn Philpot - Public Domain
United States Navy - Public Domain
Courtnk - CC BY-SA 3.0
Universal Television - Public Domain
Confederate Publishing Company - Public Domain
dj_emprical - CC BY-SA 2.0
Image from Wikimedia Commons
unknown - Public Domain
Duryea, Charles E., 1861-1938
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Billmckern - Public Domain
Paul, Willard Stewart, 1894-1966
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Panigel, Raphael Meir ben Judah, 1804-1893
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Library of Congress Prints and Photographs Division - Public Domain
Farwell, Arthur, 1872-1952
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Taylor, Rachel Annand, 1876-1960
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http://www.bibl.u-szeged.hu/sztegy/photo/778.jpg - CC BY-SA 3.0
Radó, Tibor, 1895-1965
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David Shankbone - CC BY-SA 3.0
Pennebaker, D. A.
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Sabinus, Georg, 1508-1560
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Thibaudeau, Antoine-Claire, comte, 1765-1854
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Sumon07 - CC BY-SA 4.0
Goodman, John C.
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Alexandrine, consort of Christian X, King of Denmark, 1879-1952
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Al Aumuller, World Telegram staff photographer - Public Domain
Tamiris, Helen, 1905-1966
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Liszt, Franz von 1851-1919
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'''IVIC''' (Instituto Venezolano de Investigaciones Científicas) -
Fernández Morán Villalobos, Humberto, 1924-1999
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Crawford, F. Marion (Francis Marion), 1854-1909
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no name - Public Domain
Cole, Alphaeus Philemon, 1876-1988
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Utter, André (1886-1948).
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MC2 Erica R. Gardner, USN - Public Domain
Baker, Anita
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Glyn Philpot - Public Domain
Furse, Katharine, 1875-1952
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United States Navy - Public Domain
Edwards, Richard S. (Richard Stanislaus), 1885-1956
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Carnegie Endowment for International Peace.
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Velarde, Pedro 1778-1808
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unknown - Public Domain
Ellicott, John, 1706-1772
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Courtnk - CC BY-SA 3.0
Krehbiel, Albert Henry, 1873-1945
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Universal Television - Public Domain
McCord, Kent
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Kirsch, Sarah
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Confederate Publishing Company - Public Domain
Parker, William Harwar, 1826-1896
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Tenkai, 1536-1643
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dj_emprical - CC BY-SA 2.0
Mitchell, John Cameron
Image from Wikimedia Commons
Gaulier, Philippe