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University of Nevada, Las Vegas (UNLV) - Public Domain
Byron LaGoy - CC BY-SA 3.0
unknown - Public Domain
Knud Bergslien - Public Domain
Andemaya - CC BY-SA 4.0
Congressional bioguide - Public Domain
Plainsense - CC BY-SA 3.0
Joseph S. Diller (photographer) - Public Domain
Jonathan Richardson - Public Domain
Henry Chase - Public Domain
original uploader - Public Domain
Photo from Aleksander Janta archive, non specified. -
(...) Basch / Opdracht Anefo - CC BY-SA 3.0
Norris Galpin Osborn (1858-1932). - Public Domain
Fronteiras do Pensamento - CC BY-SA 2.0
Todd Walsh -
Vogler - CC BY-SA 4.0
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University of Nevada, Las Vegas (UNLV) - Public Domain
Hughes, Howard Robard, 1869-1924
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Melville, George Melville, Earl of, 1634?-1707
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Byron LaGoy - CC BY-SA 3.0
Rodney, Lester, 1911-2009
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Humphreys, Humphrey, 1648-1712
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unknown - Public Domain
Green, Samuel Swett, 1837-1918
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Katz, Jack, 1927-
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Knud Bergslien - Public Domain
Maurer, Konrad von 1823-1902
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Montale, Eugénio, 1896-1981
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Andemaya - CC BY-SA 4.0
Parsons, Alan
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Lorentowicz, Jan, 1868-1940
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Ralston, Jobyna, 1901-1967
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Congressional bioguide - Public Domain
Edmondson, James Howard, 1925-1971
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unknown - Public Domain
Huntington, Arabella Duval, 1850 or 1851-1924
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Plainsense - CC BY-SA 3.0
Whittle, Stephen, 1955-....
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Joseph S. Diller (photographer) - Public Domain
Hill, Robert Thomas, 1858-1941
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unknown - Public Domain
Jack, David Russell, -1913
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Jonathan Richardson - Public Domain
Oxford, Robert Harley, earl of, 1661-1724
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Henry Chase - Public Domain
Hunton, Jonathan Glidden, 1781-1851
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original uploader - Public Domain
Bachman, John, 1790-1874
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Photo from Aleksander Janta archive, non specified. -
Grydzewski, Mieczysław, 1894-1970
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Waitz, Grete, 1953-2011
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(...) Basch / Opdracht Anefo - CC BY-SA 3.0
Rangell, Leo
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Jähns, Friedrich Wilhelm, 1809-1888
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Norris Galpin Osborn (1858-1932). - Public Domain
Weeks, Frank B., 1854-1935
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Fronteiras do Pensamento - CC BY-SA 2.0
Paglia, Camille, 1947-....
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unknown - Public Domain
LaFarge, Christopher, 1897-1956
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Fallada, Hans, 1893-1947
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Todd Walsh -
McNutt, Marcia Kemper, 1952-
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McMahon, Julian, 1968-
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Vogler - CC BY-SA 4.0
Ralph, Bo