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unknown, picture taken 1917 - Public Domain
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William Ramsay - Public Domain
unknown - Public Domain
Henry William Beechey - Public Domain
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Henry Weekes -
Theodor de Bry (engraver) - Original uploader was Trintheim - Public Domain
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Igel B TyMaHe - CC BY-SA 3.0
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Sir Henry Raeburn - Public Domain
United States Senate Historical Office - Public Domain
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Taillevent, approximately 1315-1395
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Arora, David
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(Photo by Air Force Master Sgt. Mike R. Smith, National Guard Bureau) (Released) - Public Domain
Wilson, Michael H. (Michael Holcombe), 1937-
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Peterborough, Henry Mordaunt, Earl of, 1624?-1697
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Upson, Christopher Columbus, 1829-1902
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unknown, picture taken 1917 - Public Domain
Boltwood, Bertram Borden, 1870-1927
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sthenry71 - CC BY-SA 2.0
Kuhn, Mona, 1969-....
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Pucci, Antonio, 1485-1544
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Kimbrell, James, 1967-....
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Laughlin, Robert B.
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Lippmann, Edmund O. von (Edmund Oskar), 1857-1940
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Gottschall, Rudolf von 1823-1909
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William Ramsay - Public Domain
Rutherford, Daniel, 1749-1819
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Bardeen, Charles Russell, 1871-1935
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Fowler, William Weekes, 1849-1923
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unknown - Public Domain
Gilbert, John Thomas, Sir, 1829-1898
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Henry William Beechey - Public Domain
Gambier, James Gambier, Baron, 1756-1833
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Bokalex - CC BY-SA 4.0
Gurvitch, Georges, 1894-1965
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Henry Weekes -
Colebrooke, H.-T. (Henry Thomas), 1765-1837
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Theodor de Bry (engraver) - Original uploader was Trintheim - Public Domain
Apian, Peter, 1495-1552
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Atael Weissman -
Makowicz, Adam, 1940-
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Schwartz, Buky, 1932-2009
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Luc, J. A. de (Jean André), 1727-1817
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Igel B TyMaHe - CC BY-SA 3.0
Arcaro, Eddie, 1916-1997
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Mingle Media TV - CC BY-SA 2.0
O'Neal, Tatum, 1963-
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Pendleton, Alexander Swift, 1840-1864
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Sir Henry Raeburn - Public Domain
Farquhar, Walter, 1738-1819
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United States Senate Historical Office - Public Domain
Thomas, Jesse Burgess, 1777-1853
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Troy, John Thomas, 1739-1823
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Mathew, Arnold Harris, 1852-1919