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Victorcouto - Public Domain
Uncredited - Public Domain
US Government Printing Office - Public Domain
International Soil Science Society, 1927 - Public Domain
Prakash Moolbharathi - CC BY-SA 4.0
A. Brothers - Public Domain
Procurandolucas - CC BY-SA 4.0
Perry, William Stevens - CC BY-SA 4.0
unknown - Public Domain
Bassano - Public Domain
Iain C. Phillips - CC BY-SA 3.0
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:fr:Studio Harcourt - CC BY 3.0
Iaconianni family -
Jamesplay00 - Public Domain
Ohio Historical Society - Public Domain
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US Gov - Public Domain
Adams, Brock, 1927-2004
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Victorcouto - Public Domain
Sena, Jorge de
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Uncredited - Public Domain
Lubin, Siegmund, -1923
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US Government Printing Office - Public Domain
Kilday, Paul Joseph, 1900-1968
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Clint, George, 1770-1854
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International Soil Science Society, 1927 - Public Domain
Marbut, Curtis Fletcher, 1863-1935
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Eckart, Dennis E.
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Prakash Moolbharathi - CC BY-SA 4.0
Shyam Sunder, B., 1908-1975
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A. Brothers - Public Domain
Williamson, William Crawford, 1816-1895
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Leclerc, Charles, 1772-1802
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Procurandolucas - CC BY-SA 4.0
Fernandes, Maria Helena Rosas
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Perry, William Stevens - CC BY-SA 4.0
Wilmer, Richard H. (Richard Hooker), 1816-1900
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Arnim, Ludwig Achim, Freiherr von, 1781-1831
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Byron, George Gordon Byron, baron, 1788-1824
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unknown - Public Domain
Nösselt, Johann August, 1734-1807
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Bassano - Public Domain
Pound, Dudley, Sir, 1877-1943
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Iain C. Phillips - CC BY-SA 3.0
Menuhin, Yaltah
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Jones, J. R. Kilsby (James Rhys Kilsby), 1813-1889
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Globke, Hans, 1898-1973
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Betancourt, Agustín de 1758-1824
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Van Gelder, Richard G. (Richard George), 1928-1994
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:fr:Studio Harcourt - CC BY 3.0
Arditi, Pierre, 1944-....
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Iaconianni family -
Scola, Ettore, 1931-....
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Jamesplay00 - Public Domain
Lowe, Arthur, 1915-1982
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Ohio Historical Society - Public Domain
Ruggles, Benjamin, 1783-1857
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Noverre, Jean Georges, 1727-1810
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Ferris, George Washington Gale, 1859-1896
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Pritt, D. N. (Denis Nowell), 1887-1972
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Herzog, Isaac, 1888-1959
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Clifford, Edward, 1844-1907