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O.H. Willard - Public Domain
unknown - Public Domain
Eric Koch (ANEFO) - CC0 1.0
not credited - Public Domain
Alice Dixon Le Plongeon (1851-1910) -
Theodore Pietsch - CC BY-SA 4.0
Americanoperastudies - CC BY-SA 4.0
Engraving by S. Freeman - Public Domain
unknown photographer - Public Domain
Christoph Schildknecht, Fürth - Public Domain
No photographer credited. - Public Domain
Alan Light - CC BY 2.0
NBC - Public Domain
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Robarts, John P., 1917-
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Wescott, John W. (John Wesley), 1849-1927
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O.H. Willard - Public Domain
Willard, Antonia Ford, 1838-1871
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unknown - Public Domain
Victor, Frances Fuller, 1826-1902
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Eric Koch (ANEFO) - CC0 1.0
Fischer-Dieskau, Dietrich, 1925-2012
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not credited - Public Domain
Bright, Jacob, 1821-1899
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Adler, Hermann, 1839-1911
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Alice Dixon Le Plongeon (1851-1910) -
Le Plongeon, Augustus, 1826-1908
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Simon, Jules, 1814-1896
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Aspasia
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Doherty, Ken, 1905-1996
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Phạm, Văn Đồng, 1906-2000
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Theodore Pietsch - CC BY-SA 4.0
Holthuis, L. B.
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unknown - Public Domain
Kucinich, Dennis J., 1946-....
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Palmstedt, Erik, 1741-
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Americanoperastudies - CC BY-SA 4.0
Rodríguez, Robert Xavier
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Campbell, Ben Nighthorse, 1933-
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Lugard, F. D. (Frederick Dealtry), Sir, 1858-1945
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Engraving by S. Freeman - Public Domain
Colquhoun, Patrick, 1745-1820
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Saint-Ange, Ange-François Fariau de (1747-1810).
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unknown photographer - Public Domain
Dijksterhuis, E.J. (Eduard Jan), 1892-1965
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Christoph Schildknecht, Fürth - Public Domain
Löhe, Wilhelm, 1808-1872
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No photographer credited. - Public Domain
Cholmondeley, Mary, 1859-1925
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Henshaw, Henry W. (Henry Wetherbee), 1850-1930
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Voght, C. (Caspar), Freiherr von, 1752-1839
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Mackenzie, James, 1853-1925
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Alan Light - CC BY 2.0
Henderson, Florence
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Fawcett, William, Sir, 1728-1804
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Hart, D. Berry (David Berry), 1851-1920
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NBC - Public Domain
Newman, Edwin