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Theodore C. Marceau - Public Domain
State of Minnesota - Public Domain
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unknown - Public Domain
baldeaglebluff - CC BY-SA 2.0
Jac. de Nijs / Anefo -
Rob Bogaerts / Anefo - CC0 1.0
TheMighty - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
U.S. Army Signal Corps (1917) - Public Domain
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Public Domain
Tonylundman - CC BY-SA 3.0
Túrelio - CC BY-SA 2.0
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Widnall, William B. (William Beck), 1906-1983
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Theodore C. Marceau - Public Domain
Conklin, Edwin Grant, 1863-1952
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State of Minnesota - Public Domain
Rines, Henry, 1872-1950
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Bundy, Hezekiah S. (Hezekiah Sanford), 1817-1895
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Beveridge, Albert J. (Albert Jeremiah), 1862-1927
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LANL - Public Domain
Von Neumann, John, 1903-1957
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Gilbert, Ashurst Turner, 1786-1870
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unknown - Public Domain
Fisher, Bud, 1885-1954
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baldeaglebluff - CC BY-SA 2.0
Baker, Kenny, 1926-2011
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Moeser, James
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Winslow, Warren, 1810-1863
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Seillière, Ernest Antoine Aimé Léon, Baron, 1866-
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Jac. de Nijs / Anefo -
Fiedler, Leslie A.
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Day, Jeremiah, 1773-1867
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Westmoreland, William Childs, 1914-2005
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Ipatieff, Vladimir N. (Vladimir Nikolaevich), 1867-1952
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Rob Bogaerts / Anefo - CC0 1.0
Herzberg, Judith
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TheMighty - Public Domain
Beltran, Robert, 1953-
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Mathew Brady Levin Corot Handy - Public Domain
Christiancy, Isaac Peckham, 1812-1890
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Brändström, Elsa, 1888-1948
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Marquina, Eduardo, 1879-1946
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Boulter, Hugh, 1672-1742
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Keith, Ian, 1899-1960
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Louise Victoria Alexandra Dagmar, 1st Duke of Fife, Princess Royal, 1867-1931
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U.S. Army Signal Corps (1917) - Public Domain
McIver, George Willcox, 1858-1947
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White Literary LLC - CC BY-SA 3.0
White, Katharine Sergeant Angell
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Garland, Frank Caldwell, 1950-2010
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Public Domain
Leopold, Luna B. (Luna Bergere), 1915-2006
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Tonylundman - CC BY-SA 3.0
Eliasson, Anders, 1947-2013
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Túrelio - CC BY-SA 2.0
Gallo, Robert C.