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Dkandell - CC BY-SA 3.0
Pierre-François Mouriaux - CC BY-SA 4.0
Nightscream -
Erna Pfeiffer - CC BY-SA 3.0
Public Domain
published by L. C. Page and Company, Boston, 1903 - Public Domain
JJDL - CC BY-SA 4.0
unknown - Public Domain
Philkon - Public Domain
anonymous photographer; Merkel Collection. - Public Domain
Illegible - Public Domain
Babrinson77 - CC BY-SA 3.0
George Iles - Public Domain
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Dkandell - CC BY-SA 3.0
Aronofsky, Darren
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Lepsius, Richard, 1810-1884
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Pierre-François Mouriaux - CC BY-SA 4.0
Dollfus, Audouin
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Shaler, Alexander, 1827-1911
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Gonzalez Bravo, Luis
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Nightscream -
Goldberg, Stan
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Groby, Thomas Grey, Baron of, 1623?-1657
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Erna Pfeiffer - CC BY-SA 3.0
Valenzuela, Luisa, 1938-....
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Little, J. C. (Jesse Carter), 1815-1893
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Public Domain
Ruffner, Clark L. (Clark Louis), 1903-1982
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published by L. C. Page and Company, Boston, 1903 - Public Domain
McCutcheon, George Barr, 1866-1928
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JJDL - CC BY-SA 4.0
Silva Herzog, Jesús, 1892-1985
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Stifter, Adalbert, 1805-1868
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unknown - Public Domain
Chicherin, B. N. (Boris Nikolaevich), 1828-1904
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Philkon - Public Domain
Smith, Gary, 1950-
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Jacobus Philippus, Bergomensis, 1434-1520
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Cobb, C. L. (Clinton Levering), 1842-1879
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Gibbons, Sam M. (Sam Melville), 1920-2012
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anonymous photographer; Merkel Collection. - Public Domain
MacDonald, Angus L. (Angus Lewis), 1890-1954
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Frank, Augustus
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Stone, Benjamin 1838-1914
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Maupassant, Guy de, 1850-1893
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unknown - Public Domain
Chasles, Philarète, 1798-1873
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Marsilius, of Inghen, -1396
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Kolbe, Hermann, 1818-1884
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Illegible - Public Domain
Duprez, Gilbert, 1806-1896
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Babrinson77 - CC BY-SA 3.0
Johnson, Luther, 1934-1976
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Kent, Jean, 1921-2013
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Sitte, Camillo, 1843-1903
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George Iles - Public Domain
Stevens, John, 1749-1838