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unknown - Public Domain
Public Domain
Anonymous - Public Domain
jimmyack205 - CC BY 2.0
NBC Television - Public Domain
Photo by Elson-Alexandre, Los Angeles - Public Domain
''The Studio'' & John Henry Frederick Bacon - Public Domain
U.S. Military Academy Archives - Public Domain
Brady National Photographic Art Gallery - Public Domain
Walter Shirlaw - Public Domain
Carl Breitbach (1833–1904) - Public Domain
Atelier Rude - CC BY-SA 4.0
Abbie Kilburn Robinson - Public Domain
U.S. Air Force - Public Domain
Unknown / desconocido - Public Domain
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unknown - Public Domain
Thayer, Ernest Lawrence, 1863-1940
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Monks, George H. (George Howard), 1853-1933
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Public Domain
Warren, George Washington, 1813-1883
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Anonymous - Public Domain
Birague, Rene de
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Giacconi, Riccardo.
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jimmyack205 - CC BY 2.0
Mattingly, Don, 1961-
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NBC Television - Public Domain
Williams, John, 1903-1983
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Baldwin, John F., 1915-1966
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unknown - Public Domain
Cook, Frederick Albert, 1865-1940
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Photo by Elson-Alexandre, Los Angeles - Public Domain
Hanna, William, 1910-2001
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''The Studio'' & John Henry Frederick Bacon - Public Domain
Voysey, Charles F. A., 1857-1941
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U.S. Military Academy Archives - Public Domain
Wright, George, 1803-1865
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Scott, Charles Prestwich, 1846-1932
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Brady National Photographic Art Gallery - Public Domain
Delafield, Richard, 1798-1873
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Walter Shirlaw - Public Domain
Shirlaw, Walter, 1838-1909
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Carl Breitbach (1833–1904) - Public Domain
Fontane, Theodor, 1819-1898
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Hart, Charles E. (Charles Edward), 1900-1991
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Plücker, Julius, 1801-1868
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Hanson, Lars, 1887-1965
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Atelier Rude - CC BY-SA 4.0
Scharffenberg, Johan, 1869-1965
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Abbie Kilburn Robinson - Public Domain
Kilburn, B. W. (Benjamin West), 1827-1909
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Public Domain
Carové, Friedrich Wilhelm, 1789-1852
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Mackintosh, A. L. A. (Aeneas Lionel Acton), 1879-1916
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Carpi, Aldo, 1886-1973
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U.S. Air Force - Public Domain
Cassidy, Duane H., 1933-
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Unknown / desconocido - Public Domain
Jászi, Oszkár, 1875-1957
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Dingley, Nelson, 1832-1899
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unknown - Public Domain
Cournot, A.A. (Antoine Augustin), 1801-1877
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Wheeler, Charles, 1892-1974
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Lea, Nicholas, 1962-....