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unknown - Public Domain
Joseph Slater - Public Domain
Alexandre bonifas - Public Domain
Library of Congress - Public Domain
Illustration from ''Harper's Monthly'', vol. 44, 1872. - Public Domain
TheDuty Myth - CC BY 3.0
NBC Television - Public Domain
U.S. Navy -
Warner Brothers - Public Domain
original uploader - Public Domain
Bain News Service - Public Domain
C. Kolb - Public Domain
Pierre Auguste Cot (dessin), La Guillermie (gravure) - Public Domain
City of Chicago - Public Domain
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unknown - Public Domain
Jones, Alonzo Trévier, 1850-1923
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Joseph Slater - Public Domain
Smyth, William, 1765-1849
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Denner, Balthasar, 1685-1749
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Greene, Mott T., 1945-
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unknown - Public Domain
Albert, Wilhelm August Julius, active 1798-1822, Divisions-secretär der Harzdivision
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unknown - Public Domain
Hoddle, Robert, 1794-1881
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Alexandre bonifas - Public Domain
Bonifas, Paul, 1902-1975
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Library of Congress - Public Domain
Smith, M. L. (Martin Luther), 1819-1866
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Illustration from ''Harper's Monthly'', vol. 44, 1872. - Public Domain
Salt, Titus, Sir, 1803-1876
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Altomonte, Martino, 1657-1745
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TheDuty Myth - CC BY 3.0
Greyson, John, 1960-
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NBC Television - Public Domain
Carr, Vikki
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U.S. Navy -
Russell, James S. (James Sargent), 1903-1996
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Warner Brothers - Public Domain
Baker, Carroll, 1931-....
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Mead, Syd
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Schillings, Max von
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Giacconi, Riccardo.
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original uploader - Public Domain
Bradshaw, George, 1801-1853
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Bain News Service - Public Domain
Moulton, J. Fletcher (John Fletcher), 1844-1921
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Bartholomew, Freddie, 1924-1992
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Marin, Cheech
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C. Kolb - Public Domain
Reinkens, Joseph Hubert, 1821-1896
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Pierre Auguste Cot (dessin), La Guillermie (gravure) - Public Domain
Duret, Francisque-Joseph 1804-1865
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James, Jesse, 1847-1882
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Selwyn, Alfred Richard Cecil, 1824-1902
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Houston, Andrew Jackson, 1854-1941
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Heermann, Hugo, 1844-1935
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City of Chicago - Public Domain
Medill, Joseph, 1823-1899
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Coddington, William, 1601-1678
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Feuerbach, Anselm Friedrich, 1829-1880