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unknown photographer - Public Domain
NASA - Public Domain
NARA-Author -
stock photo, scanned by Tim Davenport - Public Domain
Djkeddie - CC BY-SA 4.0
Serge Aspeslag - Public Domain
w:Harris & Ewing photo studio - Public Domain
unknown - Public Domain
Engraved by H.B. Hall from a daguerreotype - Public Domain
A Newsam del, Lehman & Duval Lithographers, - Public Domain
CC BY 2.0
Philkon - Public Domain
Félix Nadar - Public Domain
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Meilhac, Henri, 1831-1897
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Galvin, William Francis
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unknown photographer - Public Domain
Ellis, Robert, 1892-1974
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NASA - Public Domain
Ewing, W. Maurice (William Maurice), 1906-1974
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NARA-Author -
Cox, Edward Finch, 1946-
Image from Wikimedia Commons
stock photo, scanned by Tim Davenport - Public Domain
Wagenknecht, Alfred
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Johnson, Avery, 1965-
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Djkeddie - CC BY-SA 4.0
Kazmaier, Dick
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Raddi, Giuseppe, 1770-1829
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Paolini, Marco
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Serge Aspeslag - Public Domain
Serote, Mongane Wally, 1944-....
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w:Harris & Ewing photo studio - Public Domain
Stedman, Charles Manly, 1841-1930
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Halder, Franz, 1884-1972
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unknown - Public Domain
Menius, Justus, 1499-1558
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Aubrac, Raymond
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Bonno, Giuseppe, 1711-1788
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Engraved by H.B. Hall from a daguerreotype - Public Domain
Brigham, Amariah, 1798-1849
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D'Errico, Donna 1968-....
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Starhemberg, Ernst Rüdiger, Fürst von, 1899-1956
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unknown photographer - Public Domain
Carroll, Harry
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unknown - Public Domain
Curtis, William, 1746-1799
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unknown - Public Domain
Díaz Soto y Gama, Antonio
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Folk, Joseph Wingate, 1869-1923
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A Newsam del, Lehman & Duval Lithographers, - Public Domain
Schweinitz, Lewis David von 1780-1834
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CC BY 2.0
Ritchie, Dennis M., 1941-2011
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Snider, Clifton
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Philkon - Public Domain
Schuur, Diane
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Knapp, Robert M. (Robert McCarty), 1831-1889
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Félix Nadar - Public Domain
Regnault, Alice, 1849-
Image from Wikimedia Commons
Seebohm, Henry, 1832-1895