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Bain News Service,, publisher. - Public Domain
T. O'Connor Sloan - Public Domain
anonymous - Public Domain
CrossReach - CC BY-SA 4.0
Engraved by J. Corner - Public Domain
unknown photographer - Public Domain
original uploader - Public Domain
Billy Rose Collection Sadie Martinot c. 1878 (cropped) - Public Domain
International Soil Science Society, 1927 - Public Domain
Public Domain
Seeteufel - CC BY-SA 3.0
unknown - Public Domain
Harper's Weekly - Public Domain
Moshe Pridan - Public Domain
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Bain News Service,, publisher. - Public Domain
Brand, Charles John, 1879-
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T. O'Connor Sloan - Public Domain
Cailletet, Louis Paul, 1832-1913
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Spitz, Mark
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anonymous - Public Domain
Trevena, John, 1870-
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Gipslis, Aivars
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Arad, Ron, 1951-....
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CrossReach - CC BY-SA 4.0
Moulton, James Hope, 1863-1917
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Saint-Evremond, 1613-1703
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Borodin, Mikhail Markovich, 1884-1951
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Marshall, S. S. (Samuel Scott), 1821-1890
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Mario, Jessie White, 1832-1906
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Engraved by J. Corner - Public Domain
Cruickshank, William, 1745-1800
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unknown photographer - Public Domain
Kelley-Hawkins, Emma Dunham
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original uploader - Public Domain
Manners, Hartley
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Billy Rose Collection Sadie Martinot c. 1878 (cropped) - Public Domain
Martinot, Sadie, 1861-1923
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Guglielmi, Pietro Alessandro, 1728-1804
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International Soil Science Society, 1927 - Public Domain
Marbut, Curtis Fletcher, 1863-1935
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Public Domain
McConnell, William John, 1839-1925
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Shapira, Meir, 1887-1933
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Saint-Georges, Joseph Bologne, chevalier de, 1745-1799
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Clarke, Thomas B. (Thomas Benedict), 1848-1931
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Golius, Jacobus, 1596-1667
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Seeteufel - CC BY-SA 3.0
Kistler, Cyrill, 1848-1907
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unknown - Public Domain
Bosch, Robert, 1861-1942
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Harper's Weekly - Public Domain
Howard, Joseph, 1833-1908
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Cunningham of Hyndhope, Andrew Browne Cunningham, Viscount, 1883-1963
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Ōyama, Sutematsu, 1860-1919
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Moshe Pridan - Public Domain
Williams, G. Mennen, 1911-1988
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Rothmann, Max
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D'Alemberte, Talbot