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unknown - Public Domain
Pictorial and Biographical Publishing Company, Salisbury, Missouri - Public Domain
Wilhelm Benque, photographe Ernest Flammarion-Paris-editor and publisher of book - Public Domain
Unknown USAF Photographer - Public Domain
United States Senate Historical Office - Public Domain
Public Domain
User Tagishsimon - Public Domain
Ralph Daily - CC BY 2.0
Lembeye - CC BY-SA 3.0
Contemporary portrait - Public Domain
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Thompson, Lucy, 1856-
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unknown - Public Domain
Eidlitz, Leopold, 1823-1908
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Körner, Theodor, 1791-1813
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Regiomontanus, Joannes, 1436-1476
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Pictorial and Biographical Publishing Company, Salisbury, Missouri - Public Domain
Jones, John Rice, 1759-1824
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Wilhelm Benque, photographe Ernest Flammarion-Paris-editor and publisher of book - Public Domain
Chabas, Paul-Émile 1869-1937
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unknown - Public Domain
Leblanc, Maurice, 1864-1941
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Nicholson, Samuel Danford, 1859-1923
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Unknown USAF Photographer - Public Domain
Ascani, Fred J. (Fred John), 1917-2010
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Martin-Harvey, John, Sir, 1863-1944
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Cockcroft, John, Sir, 1897-1967
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Rivero, Horacio, 1910-2000
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United States Senate Historical Office - Public Domain
Miller, H. V. M. (Homer Virgil Milton), 1814-1896
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Public Domain
Copeland, James, 1823-1857
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unknown - Public Domain
Adams, Brooks, 1848-1927
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Selecman, Charles Claude, 1874-1958
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User Tagishsimon - Public Domain
Bland, Hubert, 1856-1914
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Ralph Daily - CC BY 2.0
Lash, Hannah, 1981-
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Gaul, August, 1869-1921
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Costello, John M. (John Martin), 1903-1976
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Public Domain
Van Valkenburgh, R. B. (Robert Bruce), 1821-1888
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Whitehead, Phillip
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Lembeye - CC BY-SA 3.0
Young, Purvis, 1943-2010
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Rostow, Eugene V. (Eugene Victor), 1913-2002
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Bruce, William S. (William Speirs), 1867-1921
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Contemporary portrait - Public Domain
De la Warr, Thomas West, Baron, 1577-1618
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Blackburn, Robert Hamilton, 1920-
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Moore, Ronald D.
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Bottrigari, Ercole, 1531-1612
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Boursault, M. (Edme), 1638-1701