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Public Domain
oSiRis Naref - CC BY-SA 2.0
International Soil Science Society, 1927 - Public Domain
Antero Saalas 1873 - Public Domain
Allan warren - CC BY-SA 3.0
Carl Lender - CC BY-SA 3.0
Associated Students, University of California, Los Angeles - Public Domain
Pak doo ik - Public Domain
wd - Public Domain
unknown - Public Domain
Charles S. Rawson - Public Domain
original uploader -
Jikhan - CC BY-SA 4.0
Who-When-What Company - Public Domain
'''IVIC''' (Instituto Venezolano de Investigaciones Científicas) -
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Arctowski, Henryk, 1871-1958
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Public Domain
Volkmer, Harold L. (Harold Lee), 1931-2011
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oSiRis Naref - CC BY-SA 2.0
Guillén, Jorge, 1893-1984
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Attwood, Thomas, 1765-1838
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International Soil Science Society, 1927 - Public Domain
Marbut, Curtis Fletcher, 1863-1935
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Antero Saalas 1873 - Public Domain
Sahlberg, John Reinhold, 1845-1920
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Tuckwell, Barry
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Benson, Martin, 1689-1752
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Harvey, Gabriel, 1550?-1631
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Allan warren - CC BY-SA 3.0
Perkins, Anthony, 1932-1992
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Carl Lender - CC BY-SA 3.0
Beckenstein, Jay
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Vinkeles, Reinier, 1741-1816
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Associated Students, University of California, Los Angeles - Public Domain
Knudsen, Vern Oliver, 1893-1974
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Pak doo ik - Public Domain
Vanel, Charles, 1892-1989
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Stevenson, Letitia Green, 1843-1913
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wd - Public Domain
Gruber, Franz Xaver, 1787-1863
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Watson, James Eli, 1864-1948
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unknown - Public Domain
Chase, George C. (George Colby), 1844-1919
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Chassaignac, E. (Édouard), 1804-1879
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Charles S. Rawson - Public Domain
Doane, William Croswell, 1832-1913
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Kirkpatrick, Charles C. (Charles Cochran), 1907-1988
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unknown - Public Domain
Firmin, Joseph-Anténor, 1850-1911
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Public Domain
Fulbright, J. William (James William), 1905-1995
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Chopin, Kate, 1850-1904
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Heijermans, Herman, 1864-1924
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original uploader -
Collins, John Churton, 1848-1908
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Jikhan - CC BY-SA 4.0
Rothstein, Arnold, 1882-1928
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Who-When-What Company - Public Domain
Tipton, John, 1786-1839
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Petrov, Racho Stoi︠a︡nov, 1861-1942
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'''IVIC''' (Instituto Venezolano de Investigaciones Científicas) -
Fernández Morán Villalobos, Humberto, 1924-1999