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unknown - Public Domain
Evers, Joost / Anefo -
Boungawa - CC BY-SA 4.0
Will Hart - CC BY 2.0
National Photo Company Collection (Library of Congress) - Public Domain
University of Houston Digital Library -
Eyharburg - CC BY-SA 3.0
US Department of State, Division of Passport Control - Public Domain
Matt Becker -
O.H. Willard - Public Domain
U.S. State department - Public Domain
Karl Heinrich Otto Rühle (1874-1943) - Public Domain
Chkmm - CC BY-SA 3.0
Guggenheim Foundation - CC BY-SA 4.0
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unknown - Public Domain
Keenan, Joseph Berry, 1888-1954
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Brøgger, Waldemar Christopher, 1851-1940
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Poulbot, Francisque, 1879-1946
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Coit, Lillie Hitchcock, 1843-1929
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Clemen, Paul, 1866-1947
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Playfair, W. H. (William Henry), 1790-1857
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Vallat, Xavier, 1891-1972
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Buchez, Philippe-Joseph-Benjamin, 1796-1865
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Evers, Joost / Anefo -
Laver, Rodney George
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unknown - Public Domain
Verrill, A. Hyatt (Alpheus Hyatt), 1871-1954
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Boungawa - CC BY-SA 4.0
Williams, Richard, 1933-....
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Raynolds, W. F. (William Franklin), 1820-1894
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Will Hart - CC BY 2.0
Munn, H. Warner.
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Winkworth, Catherine, 1827-1878
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National Photo Company Collection (Library of Congress) - Public Domain
Williams, Margaret Lindsay, 1888-1960
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unknown - Public Domain
Schleicher, Gustave, 1823-1879
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University of Houston Digital Library -
Jaworski, Leon
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unknown - Public Domain
Klug, Fr. (Friedrich), 1775-1856
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Eyharburg - CC BY-SA 3.0
Puzo, Mário, 1920-1999
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US Department of State, Division of Passport Control - Public Domain
Gale, Richard Pillsbury, 1900-1973
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Hughes, Samuel, Sir, 1853-1921
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Matt Becker -
Lodge, John, 1945-
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O.H. Willard - Public Domain
Willard, Antonia Ford, 1838-1871
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Burns, Charles, 1955-....
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U.S. State department - Public Domain
Watson, Thomas J., 1914-1993
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Anton Ulrich, Herzog von Braunschweig-Wolfenbüttel, 1633-1714
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Karl Heinrich Otto Rühle (1874-1943) - Public Domain
Rühle, Otto, 1874-1943
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Chkmm - CC BY-SA 3.0
Senju, Hiroshi, 1958-
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Guggenheim Foundation - CC BY-SA 4.0
Courlander, Harold, 1908-1996
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Wigglesworth, Vincent B. (Vincent Brian), Sir, 1899-1994