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unknown photographer - Public Domain
Theodor de Bry (engraver) - Original uploader was Trintheim - Public Domain
unknown - Public Domain
Georges Biard - CC BY-SA 3.0
Anonymous photographer - Public Domain
Isaac Rosenberg (1890-1918) - Public Domain
James Reeve Stuart (1834-1905) - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Dutertre, André (1753-1842) . Illustrateur - Public Domain
Dr. A. E. ("Ted") Hill - CC BY-SA 3.0
Public Domain
Gage Skidmore - CC BY-SA 3.0
Giuliano Longone - CC BY-SA 3.0
http://wellcomeimages.org/indexplus/obf_images/ae/54/81f78603375787d81ea3e845f479.jpg - CC BY 4.0
One dead president - CC BY-SA 3.0
Engraving by Gimber and Dick after painting by artist identified as "Sloan" - Public Domain
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unknown photographer - Public Domain
Benedicks, Carl, 1875-1958
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Theodor de Bry (engraver) - Original uploader was Trintheim - Public Domain
Apian, Peter, 1495-1552
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unknown - Public Domain
Le Fanu, Joseph Sheridan, 1814-1873
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Mooney, Art 1911-1993
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Georges Biard - CC BY-SA 3.0
Zabou
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Anonymous photographer - Public Domain
Hasselmans, Alphonse, 1845-1912
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Stephenson, John Gould, 1828-1883
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Isaac Rosenberg (1890-1918) - Public Domain
Rosenberg, Isaac, 1890-1918
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James Reeve Stuart (1834-1905) - Public Domain
Scofield, Edward, 1842-1925
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Langevin, Paul, 1872-1946
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Pregerson, Harry, 1923-
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Stuart, Alexander, 1824-1886
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Mathew Brady Levin Corot Handy - Public Domain
Williams, James D. (James Douglas), 1808-1880
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Dutertre, André (1753-1842) . Illustrateur - Public Domain
Baudot, Marc-Antoine, 1765-1837
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Dr. A. E. ("Ted") Hill - CC BY-SA 3.0
Snow, Barbara K.
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Public Domain
Roe, Arthur, 1912-
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Gage Skidmore - CC BY-SA 3.0
Ashby, Linden
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Giuliano Longone - CC BY-SA 3.0
Petito, Antonio, 1822-1876
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Silver, Michael, 1965-
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Thießen, Peter Adolf, 1899-
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http://wellcomeimages.org/indexplus/obf_images/ae/54/81f78603375787d81ea3e845f479.jpg - CC BY 4.0
White, P. Bruce (Philip Bruce)
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Mathew Brady Levin Corot Handy - Public Domain
Dickey, Oliver James, 1823-1876
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Patterson, Daniel Todd, 1786-1839
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One dead president - CC BY-SA 3.0
Bang, Billy
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Johnson, Hansford T., 1936-
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Di Donato, Pietro, 1911-1992
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Casey, T. L. (Thomas Lincoln), 1831-1896
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Chrystal, G. (George), 1851-1911
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Engraving by Gimber and Dick after painting by artist identified as "Sloan" - Public Domain
Morrell, Benjamin, 1795-1839
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Owen, Hugh, 1804-1881