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unknown - Public Domain
Paul Ruet - CC BY-SA 3.0
Nv8200p - CC BY-SA 3.0
U.S. Navy - Public Domain
The Churchman Company - Public Domain
Hugo van Gelderen / Anefo -
Florida Memory - Public Domain
Msgallery - CC BY-SA 3.0
Public Domain
user at project -
United States Senate Historical Office - Public Domain
the collection of the Department of Soil Science, University of Wisconsin-Madison - Public Domain
OTFW - CC BY-SA 3.0
20th Century Fox - Public Domain
Walter Stoneman - CC BY 3.0
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Crowell, Benedict, 1869-1952
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Tallmadge, Frederick Augustus, 1792-1869
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Allen, James Cameron, 1822-1912
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unknown - Public Domain
Gonzaga, Guglielmo, 1538-1587
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Paul Ruet - CC BY-SA 3.0
Koopman, Ton, 1944-....
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Muḥammad ibn ʻAbd al-Wahhāb, 1703 or 4-1792
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unknown - Public Domain
Diggles, Silvester, 1817-1880
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Nv8200p - CC BY-SA 3.0
Steagall, Red
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Gustav IV Adolf, King of Sweden, 1778-1837
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Reynolds, Albert
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unknown - Public Domain
Hartley, Roland H., 1864-1952
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U.S. Navy - Public Domain
Fairfield, Arthur Philip, 1877-1946
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The Churchman Company - Public Domain
Anderson, Charles Palmerston, 1863-1930
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Hugo van Gelderen / Anefo -
Bosch, Juan, 1909-2001
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Florida Memory - Public Domain
Rogers, Gamble
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Msgallery - CC BY-SA 3.0
Baron, Hannelore
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Pelham, John Thomas, 1811-1894
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Lind, Jens, 1874-1939
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Howley, William, 1766-1848
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Public Domain
Speckhard, Daniel V.
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user at project -
Vilamajó, Julio, 1894-1948
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United States Senate Historical Office - Public Domain
Ewing, Tom, 1935-
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Moser, Johann Jakob, 1701-1785
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the collection of the Department of Soil Science, University of Wisconsin-Madison - Public Domain
Truog, Emil, 1884-....
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OTFW - CC BY-SA 3.0
Haushofer, Albrecht, 1903-1945
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Villamor, Jesus A., 1914-1971
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20th Century Fox - Public Domain
Ates, Roscoe, 1895-1962
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Walter Stoneman - CC BY 3.0
Im Thurn, Everard Ferdinand, 1852-1932
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Gilbreth, Frank Bunker, 1868-1924
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Quimby, Harriet, 1875-1912