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unknown - Public Domain
Stephencdickson - CC BY-SA 4.0
Ron Baker (https://www.flickr.com/photos/kingsnake) - CC BY-SA 3.0
Mathew Brady - Public Domain
George Grantham Bain Collection (Library of Congress) - Public Domain
Amarjith Mohan - CC BY-SA 4.0
Capewell & Kimmel, engravers - Public Domain
Unknown author - Public Domain
original uploader - Public Domain
GrzegorzPetka - Public Domain
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unknown - Public Domain
West, James, 1703-1772
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Stephencdickson - CC BY-SA 4.0
Plenderleith, H.J. (Harold James), 1898-1997
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Augustus Frederick, Prince, Duke of Sussex, 1773-1843
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Ron Baker (https://www.flickr.com/photos/kingsnake) - CC BY-SA 3.0
Wonderland, Carolyn
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Mathew Brady - Public Domain
Hunt, Memucan, 1807-1856
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Manuel, Niklaus, 1484?-1530
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Sonfist, Alan
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Albert, Heinrich Friedrich, 1874-1960
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George Grantham Bain Collection (Library of Congress) - Public Domain
Szymanowski, Karol
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Raabe, Wilhelm, 1831-1910
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Angelico, fra, approximately 1400-1455
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Allston, Washington, 1779-1843
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Wilde, Kim
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unknown - Public Domain
Boveri, Marcella
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Ai, Weiwei
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Štreit, Jindřich, 1946-
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Freytag, Gustav, 1816-1895
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Fichte, Johann Gottlieb, 1762-1814
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Amarjith Mohan - CC BY-SA 4.0
Hariharan, Githa, 1954-....
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Ffoulkes, Charles John, 1868-1947
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Eliot, George, 1819-1880
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Hanfstaengl, Ernst, 1887-1975
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Duane, James, 1733-1797
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Capewell & Kimmel, engravers - Public Domain
Legaré, J. M. (James Matthews), 1823-1859
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Unknown author - Public Domain
Cline, Patsy, 1932-1963
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original uploader - Public Domain
Kaempfer, Engelbert, 1651-1716
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Swarthout, Gladys, 1900-1969
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GrzegorzPetka - Public Domain
Różycki, Ludomir, 1884-1953
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Silvela, Francisco, 1845-1905
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Sabiston, David C., 1924-2009