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See below - Public Domain
unknown - Public Domain
English school of the 17th century - Public Domain
Alexander Runciman - Public Domain
Chemical Institute of America - Public Domain
Tom Aitken -
Fotograf im Auftrag der :de:United States Information Agency - Public Domain
MN1(SW) Ken Lopez - CC BY 2.0
Rachel (Ray) Strachey (1887–1940) - Public Domain
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Gellibrand, John,, Sir, 1872-1945
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Singer, Lori, 1962-
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See below - Public Domain
Butterfield, John, 1801-1869
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unknown - Public Domain
Roth, Rudolf von 1821-1895
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English school of the 17th century - Public Domain
Richmond, Ludovic Stuart, Duke of, 1574-1624
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Regan, Donald T.
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Pamphili, Olimpia Maidalchini, 1594-1656
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unknown - Public Domain
Orr, Alexander Ector, 1831-1914
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Alexander Runciman - Public Domain
Runciman, Alexander, 1736-1785
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unknown - Public Domain
Breckinridge, John, 1760-1806
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Martin, James G. (James Grubbs), 1935-
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Van Zandt, Charles C. (Charles Collins), 1830-1894
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Gates, Daryl F., 1926-2010
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Keller, Friedrich Ludwig von, 1799-1860
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Clawson, H. B. (Hiram B.)
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Chemical Institute of America - Public Domain
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940
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unknown - Public Domain
Burgess, Thornton W. (Thornton Waldo), 1874-1965
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Tom Aitken -
Aitken, Robert, 1917-2010
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Stevens, Lillian M. N. Ames, 1844-1914
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Conrad, Patrick, 1945-....
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Polk, Charles Peale, 1767-1822
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Blechen, Karl, 1798-1840
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Fotograf im Auftrag der :de:United States Information Agency - Public Domain
Patzak, Julius
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Parsons, Louella O.
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Thomas, Albert, 1898-1966
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Beato, Felice, approximately 1825-
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Luce, Stephen Bleecker, 1827-1917
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Lagos Escobar, Ricardo
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MN1(SW) Ken Lopez - CC BY 2.0
Hill, Charles, 1936-....
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Rachel (Ray) Strachey (1887–1940) - Public Domain
Waley, Arthur.