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United States Steel Corporation-sponsor of the television show. - Public Domain
Judson Strong, author. Fred K. L. Chapman, editor. World's Events Company (Chicago, IL), publisher. - Public Domain
film screenshot - Public Domain
Henry J. Cookinham, author. S. J. Clarke Publishing Company (Chicago, IL), publisher. - Public Domain
Public Domain
Gert H. Wollheim - Public Domain
Colorado State Archives - Public Domain
clean up by Iain - Public Domain
BONI AND LIVERIGHT, INC. - Public Domain
Smithsonian Institution Archives - Public Domain
U.S. DoD photo by Robert Ward - Public Domain
unknown - Public Domain
Warner Brothers Studio - Public Domain
Gage Skidmore - CC BY-SA 3.0
Rob C. Croes / Anefo -
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United States Steel Corporation-sponsor of the television show. - Public Domain
Lansing, Robert, 1929-1994
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Judson Strong, author. Fred K. L. Chapman, editor. World's Events Company (Chicago, IL), publisher. - Public Domain
Bingham, Theo. A. (Theodore Alfred), 1858-1934
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Grotius, Hugo, 1583-1645
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Murray, Andrew, 1828-1917
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film screenshot - Public Domain
Mack, Helen
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Grubb, Edward, -1816
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Lake, Arthur, 1569-1626
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Gregg, J. A. F. (John Allen Fitzgerald), 1873-1961
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Feuermann, Emanuel, 1902-1942
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Henry J. Cookinham, author. S. J. Clarke Publishing Company (Chicago, IL), publisher. - Public Domain
Johnson, Alexander Smith, 1817-1878
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Dobrowolski, Antoni Bolesław, 1872-1954
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Public Domain
Roosevelt, James Alfred, 1825-1898
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Gert H. Wollheim - Public Domain
Wollheim, Gert H., 1894-1974
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McCaffery, Larry, 1946-....
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Colorado State Archives - Public Domain
Eaton, Benjamin Harrison, 1833-1904
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clean up by Iain - Public Domain
Mingana, Alphonse, 1881-1937
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Paulding, Hiram, 1797-1878
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Public Domain
Palmer, William, 1906-1987
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Fujita, Tetsuya Theodore
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Public Domain
Stockton, Frank Richard, 1834-1902
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BONI AND LIVERIGHT, INC. - Public Domain
Kemp, Harry, 1883-1960
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Hohenlohe-Schillingsfürst, Chlodwig, Fürst zu, 1819-1901
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Smithsonian Institution Archives - Public Domain
Porter, Helen
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Cohen, Hermann, 1842-1918
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Richardson, William A. (William Adams), 1821-1896
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U.S. DoD photo by Robert Ward - Public Domain
Scholes, Gordon Glen Denton, 1931-
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unknown - Public Domain
Murdoch, James, 1856-1921
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Warner Brothers Studio - Public Domain
Huggins, Roy, 1914-2002
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Gage Skidmore - CC BY-SA 3.0
Gallego, Kate, 1981-
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Rob C. Croes / Anefo -
Chailly, Riccardo