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unknown - CC BY-SA 3.0
ABC Television. - Public Domain
Huntington Theatre Company - CC BY 2.0
Elbert Hubbard - no picture credit - Public Domain
Pip R. Lagenta - CC BY 2.0
McClees & Beck (Washington), publishers. Julian Vannerson, photographer. - Public Domain
ja - Public Domain
Anonymous - Public Domain
Rghm - CC BY-SA 4.0
uncredited - Public Domain
Houari Boumedienne - CC BY-SA 2.0
Sebastian Le Clerc - Public Domain
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Evans, Gareth J., 1944-....
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unknown - CC BY-SA 3.0
Baracchi, Pietro, 1851-
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ABC Television. - Public Domain
Tripp, Paul, 1911?-2002
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Huntington Theatre Company - CC BY 2.0
Brown, Jason Robert
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Yeaman, George H. (George Helm), 1829-1908
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Hirsch, Emile, 1985-....
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Elbert Hubbard - no picture credit - Public Domain
Armour, Philip D. (Philip Danforth), 1832-1901
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Loveless, Herschel C. (Herschel Cellel), 1911-1989
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Pip R. Lagenta - CC BY 2.0
Ellison, Harlan
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Marum, M. van (Martinus), 1750-1837
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Mazurki, Mike, 1907-1990
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Jerrold, Douglas, 1803-1857
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Wallis, John, 1616-1703
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Poncins, Gontran de, 1900-
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Fux, Johann Joseph, 1660-1741
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McClees & Beck (Washington), publishers. Julian Vannerson, photographer. - Public Domain
Knapp, Chauncey L.
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Tate, John Torrence, 1925-....
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Price, Vincent, 1911-1993
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Sanday, W. (William), 1843-1920
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Hess, Moses, 1812-1875
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ja - Public Domain
Chiba, Sonny, 1939-
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Anonymous - Public Domain
Woodbridge, Frederick James Eugene, 1867-1940
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Zinovyev, Grigory Yevseyevich, 1883-1936
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Cooper, Melville, 1896-1973
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Cardano, Girolamo, 1501-1576
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Rghm - CC BY-SA 4.0
Cameron, John Allan
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uncredited - Public Domain
Farnham, Joseph W.
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Caulfield, B. G. (Bernard Gregory), 1828-1887
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Houari Boumedienne - CC BY-SA 2.0
Hartwell, David G.
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Sebastian Le Clerc - Public Domain
Vitruvius Pollio