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U.S. Navy - Public Domain
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U.S. Army - Public Domain
Mathew Brady - Public Domain
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Inconu - Public Domain
Nv8200p - CC BY-SA 4.0
Oxford Clinical Trials Research Unit - CC BY-SA 4.0
Bain - Public Domain
Cesare Laurentio - Public Domain
Alexander Sutherland (book author) - Public Domain
Litho by Alexander Clemens Wetterling (1796-1858) - Public Domain
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unknown - Public Domain
Stone, Alfred, 1834-1908
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U.S. Navy - Public Domain
Wiley, Henry A. (Henry Ariosto), 1867-1943
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Millin, A. L. (Aubin Louis), 1759-1818
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Dalton, John Call, 1825-1889
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Mehring, Franz, 1846-1919
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Lang, David (David A.)
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Thompson, Milton O.
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Sachs, Hans, 1494-1576
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Rice, Edward E. (Edward Everett), 1848-1924
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U.S. Army - Public Domain
Long, Westray Battle Boyce, 1901-1972
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Laclos, Choderlos de, 1741-1803
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Miles, George Francis, 1852-1891
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Mathew Brady - Public Domain
Hunt, Memucan, 1807-1856
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Diez, Friedrich, 1794-1876
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Inconu - Public Domain
Schenk, Johann, 1753-1836
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Isabel Clara Eugenia, Infanta of Spain, 1566-1633
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Nv8200p - CC BY-SA 4.0
Gander, Forrest, 1956-....
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Pio, Louis, 1841-1894
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Hogarth, D.G. (David George), 1862-1927
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Wedel, Georg Wolffgang, 1645-1721
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Oxford Clinical Trials Research Unit - CC BY-SA 4.0
Altman, Douglas G.
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Fraser, Simon, 1776-1862
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unknown - Public Domain
Cavos, Catterino
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Bain - Public Domain
Leffingwell, R. C. (Russell Cornell), 1878-1960
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Cesare Laurentio - Public Domain
Imperiali, Lorenzo
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Joyce, Lucia, -1982
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Churchill, Berton, 1876-1940
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Alexander Sutherland (book author) - Public Domain
Lonsdale, William, 1799-1864
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Boughton, George Henry, 1834-1905
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Litho by Alexander Clemens Wetterling (1796-1858) - Public Domain
Chapman, F. H. af (Fredrik Henrik), 1721-1808