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Agriculus - CC BY 3.0
Wilhelm Benque (1843-1903) - Public Domain
Edwarda - CC BY-SA 3.0
U.S. Air Force Tech. Sgt. Adam M. Stump - Public Domain
unknown - Public Domain
Bowman - Public Domain
Simon1958 - CC BY-SA 3.0
Bob Embleton -
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US Government Printing Office - Public Domain
Link, Arthur A.
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Noy, William, 1577-1634
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Agriculus - CC BY 3.0
Behrend, Siegfried, 1933-1990
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Sturgeon, William, 1783-1850
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Fallada, Hans, 1893-1947
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Pastor, Ed, 1943-2018
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Khotkevych, Hnat, 1877-1938
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Gaillard, John, 1765-1826
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Ṭūsī, Naṣīr al-Dīn Muḥammad ibn Muḥammad, 1201-1274
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Wilhelm Benque (1843-1903) - Public Domain
Busnach, W. (William)
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Dam, Kenneth W.
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Patterson, Flora W. (Flora Wambaugh), 1847-1928
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Chopin, Fryderyk Franciszek
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Edwarda - CC BY-SA 3.0
Brown, Elizabeth A.R.
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U.S. Air Force Tech. Sgt. Adam M. Stump - Public Domain
Fisher, Joely, 1967-
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Butler, Richard Layton, Sir, 1885-1966
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Green, C. A. H. (Charles Alfred Howell), 1864-1944
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Reißiger, Carl Gottlieb 1798-1859
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unknown - Public Domain
Farjeon, Benjamin Leopold 1838-1903
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Corrigan, Michael Augustine, 1839-1902
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Watt, George, Sir, 1851-1930
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Charleton, Walter, 1619-1707
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unknown - Public Domain
Thorndike, Edward L. (Edward Lee), 1874-1949
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Bowman - Public Domain
Todd, Dick
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Simon1958 - CC BY-SA 3.0
Steele, Jeffrey 1931-....
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Kolbe, Georg, 1877-1947
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Stephen, E. (Edward), 1822-1885
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Pierpont, James, 1660-1714
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Bob Embleton -
Ibbeson, Graham, 1951-
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Egerton, Wilbraham Egerton, Earl, 1832-1909