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Panek - CC BY 3.0
user at project - Public Domain
Daderot - CC0 1.0
Jarek Obważanek, WRAK.PL -
Gage Skidmore - CC BY-SA 3.0
Warner Bros. - Public Domain
math.info - CC BY-SA 2.5
unknown - Public Domain
Sbannon -
US Army - Public Domain
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DJ Krush
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Mun, Albert, comte de, 1841-1914
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Draper, Herbert James, 1864-1920
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Bowman, Lee, 1914-1979
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Panek - CC BY 3.0
Bareja, Stanisław
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user at project - Public Domain
Lewis, David, 1917-2002
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Sendall, Walter J. (Walter Joseph), 1832-1904
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Daderot - CC0 1.0
Reaugh, Frank, 1860-1945
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Jarek Obważanek, WRAK.PL -
Giraud, Jean, 1938-2012
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Canga Argüelles, José, 1770-1843
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Gage Skidmore - CC BY-SA 3.0
Cho, Frank.
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Meltzer, Samuel James, 1851-1920
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Dowdell, James F. (James Ferguson), 1818-1871
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Brick, Abraham Lincoln, 1860-1908
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Barnes, Albert C. (Albert Coombs), 1872-1951
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Kapp, Friedrich, 1824-1884
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Warner Bros. - Public Domain
Cooper, Gary, 1901-1961
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Mersenne, Marin, 1588-1648
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math.info - CC BY-SA 2.5
Mandelbrojt, Szolem, 1899-
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unknown - Public Domain
Elphinstone, Mountstuart, 1779-1859
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Judge, William Quan, 1851-1896
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Madoz, Pascual, 1806-1870
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Sbannon -
Caletti, Deb.
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unknown - Public Domain
Bogdanov, A. (Aleksandr), 1873-1928
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Muḥammad ibn ʻAbd al-Wahhāb, 1703 or 4-1792
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unknown - Public Domain
Edgerton, Sidney, 1818-1900
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Coates, Florence Earle, 1850-1927
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US Army - Public Domain
Peers, William R. (William Raymond), 1914-
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Espinosa, Manuel, 1912-2006
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Lupino, Ida, 1918-1995.