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Georges Biard - CC BY-SA 3.0
unknown - Public Domain
NBC Radio-photographer-Ray lee Jackson, New York - Public Domain
North Dakota. Dept. of State - Public Domain
Tania Esquivel - CC BY-SA 4.0
Georg Müller - Public Domain
Majormarvy - CC BY 3.0
Paul Ekman Group, LLC - CC BY-SA 3.0
Lyons - Public Domain
Arnaud 25 - CC BY-SA 3.0
National Institute of Standards and Technology - Public Domain
Keith Allison - CC BY-SA 2.0
Francisco Villamena ((Engraver:Jean Leclerc (1585-1633))) - Public Domain
Unknown author, must have been taken before 1911 - Public Domain
Jaak Urmet - CC BY-SA 3.0
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Gregg, Robert Samuel, 1834-1896
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Georges Biard - CC BY-SA 3.0
Bohringer, Romane
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unknown - Public Domain
Howze, Hamilton H. (Hamilton Hawkins), 1908-
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Siloti, Alexander, 1863-1945
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NBC Radio-photographer-Ray lee Jackson, New York - Public Domain
Heidt, Horace, 1901-1986
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Williams, Esther, 1921-2013
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North Dakota. Dept. of State - Public Domain
Haugland, Brynhild, 1905-1998
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Tania Esquivel - CC BY-SA 4.0
Cuevas, Minerva, 1975-
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Langer, William, 1886-1959
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Georg Müller - Public Domain
Armand, 1806-1889
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Nedim, Ahmet, 1681-1730
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Majormarvy - CC BY 3.0
Carroll, Andrew.
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Davis, Edmund Jackson, 1827-1883
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Paul Ekman Group, LLC - CC BY-SA 3.0
Ekman, Paul.
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Koch, Pyke, 1901-1991
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Cooke, William W., -1876
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Lyons - Public Domain
Dixon, Joseph K. (Joseph Kossuth)
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Arnaud 25 - CC BY-SA 3.0
Bussy, Roger de Rabutin, comte de, 1618-1693
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National Institute of Standards and Technology - Public Domain
Burgess, G. K. (George Kimball), 1874-1932
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Keith Allison - CC BY-SA 2.0
Duncan, Tim, 1976-
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Haviland, Paul Burty, 1880-1950
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Tolón, Miguel Teurbe, 1820-1857
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Francisco Villamena ((Engraver:Jean Leclerc (1585-1633))) - Public Domain
Clavius, Christoph, 1538-1612
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Unknown author, must have been taken before 1911 - Public Domain
Whitman, Charles Otis, 1842-1910
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unknown - Public Domain
Allen, J. K. (John Kirby), 1810-1838
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unknown - Public Domain
Hartog, Philip, Sir, 1864-1947
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Jaak Urmet - CC BY-SA 3.0
Tart, Indrek, 1946-
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unknown - Public Domain
Kirby, William, 1817-1906
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Allyson, June, 1917-2006
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Hope, Henry, 1735 or 1736-1811