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Michael Pate - CC BY-SA 2.0
Public Domain
Thierry Caro - CC BY-SA 3.0
Thomson & Co, London - Public Domain
Hiart - Public Domain
Compilation and editing supervised by Cuyler Reynolds. - Public Domain
Described as "From an unfinished pencil sketch by Wentworth" - Public Domain
unknown - Public Domain
:en:American Broadcasting Company - Public Domain
Florida Supercon - CC BY 2.0
Collection of the U.S. House of Representatives - Public Domain
original uploader - Public Domain
Jollyroger & Frieda -
NASA - Public Domain
Nina - Public Domain
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Michael Pate - CC BY-SA 2.0
Dixon, Chuck, 1954-
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Clarendon, George William Frederick Villiers, Earl of, 1800-1870
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Herter, Christian Archibald, 1895-1966
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Argelander, Fr. (Friedrich), 1799-1875
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Velázquez, Diego, 1599-1660
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Paget, Debra, 1933-....
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Public Domain
Beaumont, Gustave de 1802-1866
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Aumont, Tina, 1946-2006
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Justo, Agustín P. (Agustín Pedro), 1876-1943
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Firpo, Roberto, 1884-1969
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Thierry Caro - CC BY-SA 3.0
Quivrin, Jocelyn
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Thomson & Co, London - Public Domain
Borchgrevink, Carsten Egeberg, 1864-1934
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Madison, James, 1751-1836
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Hiart - Public Domain
Bacon, Henry, 1839-1912
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Compilation and editing supervised by Cuyler Reynolds. - Public Domain
Sanford, John, 1851-1939
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Described as "From an unfinished pencil sketch by Wentworth" - Public Domain
Brainard, John G. C. (John Gardiner Calkins), 1796-1828
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unknown - Public Domain
Broyles, J. Frank, 1924-
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Jensen, Leslie, 1892-1964
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Phillimore, Walter G. F. Phillimore (Walter George Frank Phillimore), Baron, 1845-1929
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:en:American Broadcasting Company - Public Domain
Baxter, Meredith, 1947-....
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Billy, André, 1882-1971
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Wu, Peifu, 1874-1939
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Florida Supercon - CC BY 2.0
Williamson, Fred
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Orton, James, 1830-1877
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Roger, frère, 1915-2005
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Collection of the U.S. House of Representatives - Public Domain
Baker, William P., 1940-
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original uploader - Public Domain
Magnusson, Leifur, 1882-
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Jollyroger & Frieda -
Moore, Terry, 1954-
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NASA - Public Domain
United States. National Aeronautics and Space Administration
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Nina - Public Domain
Spada, Pietro, 1935-