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unknown - Public Domain
Ed Newman - CC BY 2.0
LandiaEgal - CC BY-SA 3.0
Paul Leake - Public Domain
original uploader - Public Domain
Jean-Pierre Franque - Public Domain
Knud Bergslien - Public Domain
USSR Post - Public Domain
unknown -
Nicolas Habert (graveur) + BastienM - CC BY-SA 3.0
Bain - CC BY-SA 4.0
Gage Skidmore - CC BY-SA 3.0
E Onslow Ford (27 July 1852 – 23 December 1901) - Public Domain
Royal Society uploader - CC BY-SA 4.0
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Campillo y Cosío, José del, 1693-1743
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unknown - Public Domain
Gasparotto, Luigi, 1873-1954
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Root, Erastus, 1773-1846
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Ed Newman - CC BY 2.0
McPherson, Charles
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Heitler, Walter, 1904-1981
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unknown - Public Domain
Mason, R. B. (Roswell B.), 1805-1892
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Aldiss, Brian W. (Brian Wilson), 1925-
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Weeks, John W. (John Wingate), 1860-1926
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Terra, Daniel J., 1911-1996
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LandiaEgal - CC BY-SA 3.0
Guédiguian, Robert, 1953-
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Paul Leake - Public Domain
Sibley, Solomon, 1769-1846
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Egaña, Mariano, 1793-1846
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Churchill, John Charles, 1821-1905
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DOWNEY, BRIAN
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original uploader - Public Domain
Traeger, Albert, 1830-1912
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Jean-Pierre Franque - Public Domain
Bougainville, Louis-Antoine de, comte, 1729-1811
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Knud Bergslien - Public Domain
Maurer, Konrad von 1823-1902
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Demarest, William
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USSR Post - Public Domain
Prishvin, Mikhail Mikhaĭlovich, 1873-1954
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unknown -
Cuvillier, Charles, 1877-1955
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Nicolas Habert (graveur) + BastienM - CC BY-SA 3.0
Caulet, François Etienne de 1610-1680
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Symington, James W. (James Wadsworth), 1927-
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Bain - CC BY-SA 4.0
Duncan, James, 1857-1928
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Gage Skidmore - CC BY-SA 3.0
Groening, Matt
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unknown - Public Domain
Kerns, Maude I. (Maude Irvine), 1876-1965
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Gage Skidmore - CC BY-SA 3.0
McEntire, Reba, 1955-
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E Onslow Ford (27 July 1852 – 23 December 1901) - Public Domain
Armstrong, Walter, Sir, 1850-1918
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Royal Society uploader - CC BY-SA 4.0
Dawkins, Marian Stamp.
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unknown - Public Domain
Mozoomdar, P. C. (Protap Chunder), 1840-1905
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Weber, Max, 1864-1920