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National Academy of Sciences - Public Domain
unknown - Public Domain
original uploader - Public Domain
After Colvin Smith - Public Domain
Laut, Agnes C. (Agnes Christina) -
Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
Unied States Department of Agriculture - Public Domain
Gage Skidmore - CC BY-SA 3.0
Sheldon (Shelly) Levy - CC BY-SA 2.0
United States Department of Homeland Security - Public Domain
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National Academy of Sciences - Public Domain
Smith, Alexander, 1865-1922
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unknown - Public Domain
Reissner, Hans J. (Hans Jacob), 1874-1967
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Campillo y Cosío, José del, 1693-1743
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Service, Robert W. (Robert William), 1874-1958
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Hrozný, Bedřich, 1879-1952
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original uploader - Public Domain
Stewart, Tom, 1892-1972
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After Colvin Smith - Public Domain
Horner, Leonard, 1785-1864
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Laut, Agnes C. (Agnes Christina) -
Monckton, Robert, 1726-1782
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Public Domain
Wedge, John Helder, 1793-1872
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Thomsen, Vilhelm, 1842-1927
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Goodridge, John, 1764-1786
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George Grantham Bain Collection (Library of Congress) - Public Domain
Fonck, René, 1894-1953
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Anfinsen, Christian B. (Christian Boehmer), 1916-1995
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Unied States Department of Agriculture - Public Domain
Cobb, Nathan Augustus, 1859-1932
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Armstrong, Kit, 1992-
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Robbins, William M. (William McKendree), 1828-1905
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Deer, Ada Elizabeth
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Burleson, Omar Truman, 1906-1991
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Fée, Antoine Laurent Apollinaire, 1789-1874
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Gage Skidmore - CC BY-SA 3.0
Horowitz, David, 1939-....
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Sheldon (Shelly) Levy - CC BY-SA 2.0
Shapiro, Paul, 1956-
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Breteuil, Louis-Auguste Le Tonnelier, baron de, 1730-1807
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unknown - Public Domain
Hermant, Abel, 1862-1950
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unknown - Public Domain
Brunn, Enrico, 1822-1894
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United States Department of Homeland Security - Public Domain
Lute, Jane Holl, 1956-
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Diaz, Armando, duca della Vittoria, 1861-1928
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original uploader - Public Domain
Romberg, Moritz Heinrich, 1795-1873
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Høegh-Guldberg, Ove, 1731-1808
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Binderup, Charles Gustav, 1873-1950
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Woolls, William, 1814-1893