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Michigan Academy of Science - Public Domain
unknown - Public Domain
Anonymous - Public Domain
Carlos Guevara - CC BY-SA 3.0
Tom Marcello - CC BY-SA 2.0
anonymous -
Mathew Brady Levin Corot Handy - Public Domain
anonymous - Public Domain
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Vossler, Karl, 1872-1949
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Eklund, Sigvard Arne, 1911-2000.
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Eyck, Jan van, 1390-1440
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Cobey, William W., 1939-
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Vivian, H. Hussey (Henry Hussey), 1821-1894
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Michigan Academy of Science - Public Domain
Hubbard, Bela, 1814-1896
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unknown - Public Domain
Gay, Walter, 1856-1937
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Sargent, Dudley Allen, 1849-1924
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Alessandri, Jorge, 1896-1986
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Pakenham, Edward Michael, 1778-1815
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Anonymous - Public Domain
Montgomery, L.M. (Lucy Maud), 1874-1942
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Carlos Guevara - CC BY-SA 3.0
Álvarez, Juan 1790-1867
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Horn, Zoia, 1918-2014
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Greenwood, F. W. P. (Francis William Pitt), 1797-1843
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Hollings, Ernest F., 1922-....
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Adams, Henry Cullen, 1850-1906
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Tom Marcello - CC BY-SA 2.0
Stitt, Sonny
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Arledge, Roone
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Reve, Gerard, 1923-2006
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unknown - Public Domain
Russell, Henry Norris, 1877-1957
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anonymous -
Skraup, Zdenko Hans
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Mathew Brady Levin Corot Handy - Public Domain
Steele, Walter Leak, 1823-1891
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Hora, Heinrich, 1931-....
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Farrington, Joseph R. (Joseph Rider), 1897-1954
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Best, Werner, 1903-1989
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Tucker, Thomas Tudor, 1745-1828
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Barringer, Daniel Moreau, 1806-1873
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Guillaume, Eugène, 1822-1905
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Hüe de Miromesnil, Armand Thomas, 1723-1796
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anonymous - Public Domain
Vajrabodhi, 671-741