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United States Department of Energy - Public Domain
Public Domain
Thomas Henry Soper (1870–1903) - Public Domain
Antarctic96 - CC BY-SA 3.0
unknown - Public Domain
Mathew Brady - Public Domain
George Augusta - Public Domain
Unidentified photographer - Public Domain
Harris & Ewing. - Public Domain
loustejskal - CC BY 2.0
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United States Department of Energy - Public Domain
Edwards, James B., 1927-
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Carducci, Giosuè, 1835-1907
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Public Domain
Jeppson, Morris R. (Morris Richard), 1922-2010
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Davenport, John, 1752-1830
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Adams, Alice, 1926-1999
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Thomas Henry Soper (1870–1903) - Public Domain
Slaughter, Walter, 1860-1908
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Sulte, Benjamin, 1841-1923
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Antarctic96 - CC BY-SA 3.0
Feldman, Victor, 1934-1987
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unknown - Public Domain
Perry, Mr. (William Hayne), 1839-1902
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Mathew Brady - Public Domain
Cowan, Edgar, 1815-1885
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George Augusta - Public Domain
Callaway, Howard H. (Howard Hollis), 1927-2014
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Unidentified photographer - Public Domain
Cras, Jean, 1879-1932
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Public Domain
Mackay, A.M. (Alexander Murdoch), 1849-1890
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Lindsay, William, 1835-1909
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Chancellor, William Estabrook, 1867-1963
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Stevenson, Edward, 1820-1897
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Subotnick, Morton
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unknown - Public Domain
Standing, Herbert, 1846-1923
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Bega, Cornelis Pietersz., approximately 1631-1664
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unknown - Public Domain
Hicks, George Francis, 1905-1965
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Harris & Ewing. - Public Domain
Jelliffe, Smith Ely, 1866-1945
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Rotari, Pietro, 1707-1762
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Powell, Michael, 1905-1990
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loustejskal - CC BY 2.0
Barber, Dan, 1969-
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Smith, Gustavus Woodson, 1822-1896
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Compton, Fay, 1894-1978
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Joliot-Curie, Irène, 1897-1956
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Hilton, Daisy, 1908-1969
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Sick, Emil, 1894-1964
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Stuart, Campbell, 1885-