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Rei Momo - Public Domain
Nightscream - CC BY 3.0
Public Domain
NASA/JPL - Public Domain
Columbia Phonograph Company - Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
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unknown - Public Domain
J. M. Howell and H. C. Smith - Public Domain
Staff Photographers - CC BY-SA 4.0
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Rei Momo - Public Domain
Bosco, João, 1946-
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Cayley, Neville William, 1886-1950
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Nightscream - CC BY 3.0
Breytenbach, Breyten.
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Public Domain
Randolph, Paschal Beverly, 1825-1874
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Stanyan, Abraham, 1669?-1732
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Tyndale, Hector, 1821-1880
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NASA/JPL - Public Domain
Malina, Frank J.
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Earle, Stephen Carpenter, 1839-1913.
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Zamacois Zabala, Eduardo, 1841-1871
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Savage, C. R. (Charles Roscoe), 1832-1909
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National Museum of Natural History (U.S.)
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Sutton, Betty, 1963-
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Columbia Phonograph Company - Public Domain
Prince, Charles Adams
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Furlow, Allen John, 1890-1954
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George Grantham Bain Collection (Library of Congress) - Public Domain
Grierson, James Moncrieff, 1859-1914
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Huerta, Victoriano, 1845-1916
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unknown - Public Domain
MacDowell, Edward, 1860-1908
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J. M. Howell and H. C. Smith - Public Domain
Smith, Alexander H. (Alexander Hale), 1838-1909
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unknown - Public Domain
Álvarez de Castro, Mariano, 1749-1810
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Hubbard, Gurdon Saltonstall, 1802-1886
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Blau, Peter Michael
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Cronquist, Arthur
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Newcastle, Henry Cavendish, Duke of, 1630-1691
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Russin, Robert I., 1914-2007
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Lukis, W. C. (William Collings), 1817-1892
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Centennial Exposition (1876 : Philadelphia, Pa.)
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unknown - Public Domain
Modena, Leone, 1571-1648
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Smedley, Edward, 1788-1836
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unknown - Public Domain
Mullett, A. B. (Alfred Bult), 1834-1890
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Desgenettes, R. (René), 1762-1837