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unknown - Public Domain
Peter Dench - CC BY-SA 4.0
Makevoid - CC0 1.0
Paebi - CC BY-SA 3.0
Self portrait - Public Domain
unknown photographer circa 1915 - Public Domain
Dan Lundberg - CC BY-SA 2.0
Public Domain
H. de Lambilly - CC BY-SA 3.0
David Eldan - Public Domain
Anonyme, début du XXe siècle. - CC BY-SA 4.0
Hurd, Duane Hamilton Hurd - Public Domain
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Lake, Alice, 1896-1967
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Archer, Frederick Scott
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unknown - Public Domain
Rood, Ogden N. (Ogden Nicholas), 1831-1902
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unknown - Public Domain
Schroeder, Frederick A., 1833-1899
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Liberi, Pietro
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Peter Dench - CC BY-SA 4.0
Meyer, Aubrey
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Rothschild, Alfred de
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Makevoid - CC0 1.0
Porcinai, Pietro, 1910-1986
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unknown - Public Domain
Aldrich, Charles H. (Charles Henry), 1850-1929
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Paebi - CC BY-SA 3.0
Boyd, Jim, 1956-
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Self portrait - Public Domain
Santa María, Andrés de 1860-1945
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Frakes, Jonathan
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Heisenberg, Werner, 1901-1976
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unknown - Public Domain
Irwin, William Wallace, 1803-1856
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unknown photographer circa 1915 - Public Domain
Veblen, Oswald, 1880-1960
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Dan Lundberg - CC BY-SA 2.0
Button, Dick, 1929-
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Public Domain
Cashman, Nellie, 1844-1925
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Fichte, Johann Gottlieb, 1762-1814
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Piccolomini, Ottavio, 1599-1656
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H. de Lambilly - CC BY-SA 3.0
Jaubert, Hippolyte-François, comte, 1798-1874
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Innocent IX, Pope, 1519-1591
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David Eldan - Public Domain
Greenberg, Uri Zvi, 1896-1981
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Public Domain
Gottschall, Rudolf von 1823-1909
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Olivier, Charles P. (Charles Pollard), 1884-
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Anonyme, début du XXe siècle. - CC BY-SA 4.0
Watkins, Henry George, 1907-1932
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Escher von der Linth, Arnold, 1807-1872
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Jebb, R. C. (Richard Claverhouse), 1841-1905
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Mackenzie, Colin, 1753?-1821
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Coleridge, Derwent, 1800-1883
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Hurd, Duane Hamilton Hurd - Public Domain
Crocker, Samuel L. (Samuel Leonard), 1804-1883