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Zff2012 - CC BY-SA 3.0
Repro: Albert H. Payne († 1902) - Public Domain
Lysippos - Public Domain
Unknown - Public Domain
Contemporary portrait - Public Domain
Alfred Aho - Public Domain
U.S. Army - Public Domain
GorillaWarfare - CC0 1.0
NASA - Public Domain
Unidentified photographer - Public Domain
artist unknown - Public Domain
Internet Archive Book Images -
Engraving by Gimber and Dick after painting by artist identified as "Sloan" - Public Domain
TonyTheTiger - CC BY-SA 2.5
Georges Biard - CC BY-SA 3.0
Public Domain
C.S. Bradford - Public Domain
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Coulomb, C. A. (Charles Augustin), 1736-1806
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Zff2012 - CC BY-SA 3.0
Polański, Roman
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Murray, Alexander William Charles Oliphant, Unspecified, Master of Elibank, Baron Murray of Elibank
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Repro: Albert H. Payne († 1902) - Public Domain
Klafsky, Katharina 1855-1896
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Lysippos - Public Domain
Boué, Ami, 1794-1881
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Colonna, Giovanni Paolo
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Unknown - Public Domain
Olds, Ransom Eli, 1864-1950
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Rice, William North, 1845-1928
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Torelli, Giuseppe, 1658-1709
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Contemporary portrait - Public Domain
Patrick, Simon, 1626-1707
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Bluntschli, Johann Caspar, 1808-1881
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Opatoshu, Joseph, 1886-1954
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Alfred Aho - Public Domain
Aho, Alfred V.
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Baeck, Leo, 1873-1956
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Frank, Ellen Eve.
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U.S. Army - Public Domain
McGiffert, David E., 1926-2005
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Gertrude, the Great, Saint, 1256-1302?
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GorillaWarfare - CC0 1.0
Ganz, Marshall, 1943-....
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NASA - Public Domain
Allen, Joseph P., 1937-
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Unidentified photographer - Public Domain
Kronberg, Louis, 1872-1965
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artist unknown - Public Domain
Harris, Martin, 1783-1875
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Jones, J. Glancy (Jehu Glancy), 1811-1878
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Lovelace, William King-Noel, Earl of, 1805-1893
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Internet Archive Book Images -
Friant, Émile, 1863-1932
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Engraving by Gimber and Dick after painting by artist identified as "Sloan" - Public Domain
Morrell, Benjamin, 1795-1839
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TonyTheTiger - CC BY-SA 2.5
William W. Kimball House (Chicago, Ill.)
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Georges Biard - CC BY-SA 3.0
Clerc, Julien, 1947-....
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Staunton, George, Sir, 1737-1801
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Public Domain
Fahlström, Öyvind, 1928-1976
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C.S. Bradford - Public Domain
Chew, Benjamin, 1722-1810