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George Romney - Public Domain
Facebook - CC BY 2.5
NASA - Public Domain
Otto J. Schneider (1875 - 1946) - CC BY-SA 3.0
author - Public Domain
Vermont Vermont Council of Safety, E.P. Walton - Public Domain
Robert D. Ward - Public Domain
United States Steel Corporation, the show's sponsor. - Public Domain
unknown - Public Domain
Samuel Lovett Waldo - Public Domain
unknown photographer - Public Domain
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Haywood, John, 1762-1826
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Scott, Frank Douglas, 1878-1951
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Byron, Tom 1961-....
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George Romney - Public Domain
Burgoyne, Montagu, 1750-1836
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Anjou, François, duc d', 1554-1584
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Wilde, W. R. (William Robert), 1815-1876
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Facebook - CC BY 2.5
Aberle, David F. (David Friend), 1918-2004
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NASA - Public Domain
McAuliffe, Christa, 1948-1986
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Ohair, Madalyn Murray
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Otto J. Schneider (1875 - 1946) - CC BY-SA 3.0
Jones, Herschel V. (Herschel Vespasian), 1861-1928
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author - Public Domain
Barry, John Decatur, 1839-1867
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Vermont Vermont Council of Safety, E.P. Walton - Public Domain
Jenison, Silas Hemenway, 1791-1849
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Vinckeboons, David, 1576-1629
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Withers, Grant, 1905-1959
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Vidaurri, Santiago, 1808-1867
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Béranger, Pierre-Jean de, 1780-1857
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Odo, Saint, Abbot of Cluny, approximately 879-942
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Moss, C. E. (Charles Edward), 1872-1930
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Robert D. Ward - Public Domain
Wilson, Pete, 1933-
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United States Steel Corporation, the show's sponsor. - Public Domain
Vanderbilt, Gloria, 1924-....
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Duff, Alexander, 1806-1878
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Hickok, Wild Bill, 1837-1876
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unknown - Public Domain
Pryor, Arthur, 1870-1942
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Draper, William, Sir, 1721-1787
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Samuel Lovett Waldo - Public Domain
Crosby, Enoch, 1750-1835
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Coleman, Charles Caryl, 1840-1928
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Otto I, Bishop of Freising, -1158
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Johnson, Howard, 1941-....
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Sykes, Colonel (William Henry), 1790-1872
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unknown photographer - Public Domain
Boyd, Willard L. (Willard Lee), 1927-