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original uploader - CC BY-SA 3.0
Voiceperson - CC BY-SA 3.0
William Morton Jackson Rice - Public Domain
anonymous - Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
unknown - Public Domain
Atchison, Topeka, and Santa Fe Railway Company - Public Domain
original uploader - Public Domain
not identified - Public Domain
Camille Dolard (1810-1884) - Public Domain
US Government Printing Office - Public Domain
ABC Television - Public Domain
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original uploader - CC BY-SA 3.0
Graham, Paul, 1956-....
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Tart, Quong, 1850-1903
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Osborne, Walter F. (Walter Frederick), 1859-1903
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Voiceperson - CC BY-SA 3.0
Nixon, Marni
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Merle, Robert, 1908-2004
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Candeille, Julie, 1767-1834
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William Morton Jackson Rice - Public Domain
Fowler, Frank, 1852-1910
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Gottsched, Johann Christoph, 1700-1766
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Leith, C. K. (Charles Kenneth), 1875-1956
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Emery, George W., 1830-1909
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anonymous - Public Domain
Urso, Camilla, 1842-1902
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George Grantham Bain Collection (Library of Congress) - Public Domain
Phillips, David Graham, 1867-1911
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Plunkett, George Noble Plunkett, Count, 1851-1948
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unknown - Public Domain
Hoffmann, Josef Franz Maria, 1870-1956
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Atchison, Topeka, and Santa Fe Railway Company - Public Domain
Landis, J. Cullen, 1895-1975
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Adams, Eva Bertrand, 1908-1991
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Moscherosch, Johann Michael, 1601-1669
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Simonson, Lee, 1888-1967
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Bow, Frank T. (Frank Townsend), 1901-1972
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Ghiaurov, Nicolai, 1929-2004
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original uploader - Public Domain
Goldfaden, Abraham, 1840-1908
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not identified - Public Domain
Bavin, Thomas, Sir, 1874-
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Camille Dolard (1810-1884) - Public Domain
Appian, Adolphe, 1818-1898
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US Government Printing Office - Public Domain
McCloskey, Paul N., 1927-
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Guglielmi, Pietro Alessandro, 1728-1804
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ABC Television - Public Domain
Clark, Dane, 1912-1998
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unknown - Public Domain
Lemaître, Jules, 1853-1914
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Montucla, Jean-Étienne (1725-1799).
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Eldridge, Florence
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US Government Printing Office - Public Domain
Watson, Albert William, 1922-1994