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Pierre Roch Vigneron - Public Domain
:de:Julius Thaeter - Public Domain
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Smithsonian Institution -
Johndesmarteau - CC BY-SA 4.0
Carl Traugott Riedel Johann Gottfried Schadow - Public Domain
Brown Bros. - Public Domain
Smithsonian American Art Museum. - Public Domain
unknown - Public Domain
ABC Television - Public Domain
:fr:Étienne Carjat - Public Domain
Michiel Hendryckx - CC BY-SA 4.0
Udo Grimberg -
Victuallers - CC BY-SA 3.0
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Don Usner / Lannan Foundation - CC BY-SA 2.0
Jones, Ann, 1937-
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Pierre Roch Vigneron - Public Domain
Melling, Antoine-Ignace, 1763-1831
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O'Hara, James, 1752-1819
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:de:Julius Thaeter - Public Domain
Rietschel, Ernst, 1804-1861
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The National Archives UK -
Nkrumah, Kwame, 1909-1972
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Smithsonian Institution -
Lipmann, Fritz (Fritz Albert), 1899-1986
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Hebra, Ferdinand, Ritter von, 1816-1880
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Staigg, Richard Morrell, 1817-1881
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Harispe, Jean, 1768-1855
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Arago, F. (François), 1786-1853
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Loomis, Alfred L. (Alfred Lee), 1887-1975
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Johndesmarteau - CC BY-SA 4.0
Hautzig, Walter
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Carl Traugott Riedel Johann Gottfried Schadow - Public Domain
Fasch, Carl Friedrich Christian, 1736-1800
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Brown Bros. - Public Domain
Delano, Frederic Adrian, 1863-1953
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Grzesinski, Albert, 1879-1947
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Webb, Alfred, 1834-1908
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Dolbear, A. E. (Amos Emerson), 1837-1910
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Turner, J. M. W. (Joseph Mallord William), 1775-1851
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Grierson, Francis, 1848-1927
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Smithsonian American Art Museum. - Public Domain
Hancock, Walker Kirtland, 1901-1998
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unknown - Public Domain
Salomon, Edward S. (Edward Selig), 1836-1913
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ABC Television - Public Domain
Bill, Tony, 1940-....
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Kinzie, John H., Mrs., 1806-1870
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:fr:Étienne Carjat - Public Domain
Cham, 1819-1879
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Palladio, Andrea, 1508-1580
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Michiel Hendryckx - CC BY-SA 4.0
Zorio, Gilberto Gilberto, 1944-
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Udo Grimberg -
Roland, Jürgen 1925-2007
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Virginia Tech
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Basov, N. G. (Nikolaĭ Gennadievich), 1922-2001
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Victuallers - CC BY-SA 3.0
Bass, Michael T. (Michael Thomas), 1799-1884