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D. O. Hill - Public Domain
Philosopher nis - Public Domain
unknown - Public Domain
James Godby after J. Hunter - Public Domain
Daniel Shen - CC BY-SA 2.0
Unknown military photographer of the Signal Corps - Public Domain
David Shankbone - CC BY-SA 3.0
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Gatschet, Albert S. (Albert Samuel), 1832-1907
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Gephardt, Richard A. (Richard Andrew), 1941-
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Thomson, Elihu, 1853-1937
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Bland, W. (William), 1789-1868
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Public Domain
Pennoyer, Sylvester, 1831-1902
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Lacordaire, Henri-Dominique, 1802-1861
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Watson, William J. (William John), 1865-1948
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Hitchcock, Charles H. (Charles Henry), 1836-1919
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Dayan, Moshe, 1915-1981
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Sulzer, Johann Georg, 1720-1779
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D. O. Hill - Public Domain
Grose, Francis, 1731?-1791
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Philosopher nis - Public Domain
Marković, Mihailo, 1923-2010
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unknown - Public Domain
Barron, Clarence W. (Clarence Walker), 1855-1928
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unknown - Public Domain
Pavie, Auguste, 1847-1925
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Public Domain
Fraser, John, 1827-1878
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James Godby after J. Hunter - Public Domain
Fawcett, John, 1740-1817
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Edgeworth, Michael Pakenham 1812-1881
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Sargent, John Singer, 1856-1925
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Carpenter, William Boyd, 1841-1918
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Sobol, Yehoshuʻa
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Martin, Henri, 1810-1883
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Stobaeus, Johann, 1580-1646
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Tintoretto, Domenico, 1560-1635
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Daniel Shen - CC BY-SA 2.0
Valdés, Chucho
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Rochambeau, Jean-Baptiste-Donatien de Vimeur, comte de, 1725-1807
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Unknown military photographer of the Signal Corps - Public Domain
Marshall, S.L.A. (Samuel Lyman Atwood), 1900-1977
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Public Domain
Fowler, Joseph Smith, 1820-1902
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David Shankbone - CC BY-SA 3.0
Warhola, James
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Luna, Antonio, 1866-1899
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Ross, Lewis Winans, 1812-1895