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anonymous - Public Domain
anonymous -
PMPProd - CC BY-SA 4.0
Nobel Foundation -
unknow (uploader Claudio Elias) - Public Domain
Henrietta Elizabeth Bromwell (author). W. F. Robinson Printing Co. (Denver, CO), publisher - Public Domain
Javier Paredes - CC BY-SA 2.0
original uploader - Public Domain
USA.gov’s Image Search - Public Domain
Philippon (Versailles) - Public Domain
unknown - Public Domain
Pigsonthewing - CC BY-SA 3.0
Department of Defense - Public Domain
USDAgov - Public Domain
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Barnes, Robert, 1817-1907
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anonymous - Public Domain
White, Canvass, 1790-1834
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anonymous -
Lucas, Daniel Bedinger, 1836-1909
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Martin, Charles, 1866-1955
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PMPProd - CC BY-SA 4.0
Garfein, Jack
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Nobel Foundation -
Karrer, Paul, 1889-1971
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Terra, Daniel J., 1911-1996
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unknow (uploader Claudio Elias) - Public Domain
Houssay, Bernardo A. (Bernardo Alberto), 1887-1971
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Abercrombie, Patrick, 1879-1957
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Henrietta Elizabeth Bromwell (author). W. F. Robinson Printing Co. (Denver, CO), publisher - Public Domain
Leffler, Shepherd, 1811-1879
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Jacquet de la Guerre, Elisabeth-Claude (1665-1729).
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Frothingham, James
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Davis, William G.
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Lang, David (David A.)
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D'Andrea, Girolamo 1812-1868
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Javier Paredes - CC BY-SA 2.0
Garrel, Philippe
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Glennie, Evelyn
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original uploader - Public Domain
Robins, Raymond, 1873-1954
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Parker, Joseph, 1830-1902
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USA.gov’s Image Search - Public Domain
Cavallero, Ugo, 1880-1943
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Braun, Heinrich, 1862-1934
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Abercromby, John, 1841-1924
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Freeman, Morgan
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Philippon (Versailles) - Public Domain
Petipa, Lucien, 1815-1898
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unknown - Public Domain
Rheinberger, Josef
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Pigsonthewing - CC BY-SA 3.0
Greenberg, Joshua M.
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Department of Defense - Public Domain
Berry, Sidney B. (Sidney Bryan), 1926-2013
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Benedict, Stanley R. (Stanley Rossiter), 1884-1936
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unknown - Public Domain
Parsons, Lucy E. (Lucy Eldine), 1853-1942
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USDAgov - Public Domain
Silver, Sandy