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Angela George - CC BY 3.0
Portrait of John Clarkson, painter unknown. - Public Domain
(Presumably) International News ''(or Newsreel)'' Photos, Inc. - Public Domain
Photographer: Detlef Maugsch - CC BY 3.0
Public Domain
The Library of Congress -
Gage Skidmore - CC BY-SA 3.0
Joseph Gaston, George H. Himes - Public Domain
unknown - Public Domain
National Library of Medicine - Public Domain
Nathaniel Bartlett Sylvester - Public Domain
Σ, retouched by Wugapodes - CC BY-SA 4.0
w - Public Domain
J.Schmeller -
image cropped and colored by my own - Public Domain
United States Congress - Public Domain
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Rask, Rasmus, 1787-1832
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Molinier, A. (Auguste), 1851-1904
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Angela George - CC BY 3.0
Beauvais, Garcelle, 1966-....
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Jenness, Diamond, 1886-1969
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Bradley, Dan Beach, 1804-1873
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Charles V, Holy Roman Emperor, 1500-1558
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Lionne, Hugues de 1611-1671
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Kneeland, Abner, 1774-1844
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Portrait of John Clarkson, painter unknown. - Public Domain
Clarkson, John, 1764-1828
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(Presumably) International News ''(or Newsreel)'' Photos, Inc. - Public Domain
Hoover, Allan, 1907-1993
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Photographer: Detlef Maugsch - CC BY 3.0
Beyer, Frank Michael
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Public Domain
Einhorn, Ira, 1940-
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Holman, W. A. (William Arthur), 1871-1934
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MacPherson, Ian, 1939-
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Watson, Richard, 1781-1833
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The Library of Congress -
Clinton, Larry, 1909-1985
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Public Domain
Newell, James Michael, 1900-
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Gage Skidmore - CC BY-SA 3.0
Bridges, Jeff, 1949-....
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Joseph Gaston, George H. Himes - Public Domain
Pettygrove, F. W. (Francis William), 1812-1887
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unknown - Public Domain
Gatto, Alfonso, 1909-1976
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National Library of Medicine - Public Domain
Wright, Jane C., 1919-2013
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Ralph, Brett
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Nathaniel Bartlett Sylvester - Public Domain
Westbrook, Theodoric R., -1885
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Σ, retouched by Wugapodes - CC BY-SA 4.0
Chomsky, Noam, 1928-
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w - Public Domain
Dusenberry, Ida Smoot, 1873-1955
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J.Schmeller -
Reinhard, Karl Friedrich, Graf, 1761-1837
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unknown - Public Domain
Tyler, James M., 1835-
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image cropped and colored by my own - Public Domain
Faguet, Émile, 1847-1916
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Norman, Madie, 1912-1998
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United States Congress - Public Domain
Zorinsky, Edward, 1928-1987