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Flickr account - CC BY 2.0
unknown - Public Domain
Hans Holbein d. J. - Public Domain
Lai Afong - Public Domain
unknown; scanned by myself - Public Domain
Leslie Gottlieb - CC BY 2.0
United States Congress - Public Domain
Nellie Van de Grift Sanchez - Public Domain
פרס א.מ.ת - CC BY-SA 3.0
anonymous/unknown - Public Domain
SUN RISE - Public Domain
State Library of New South Wales collection -
NASA - Public Domain
Andrea Booher - Public Domain
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Fontana, Bill, 1947-
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Beard, John, 1715 or 1716-1791
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Nerman, Einar, 1888-
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Gruzman, Neville, 1925-
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Flickr account - CC BY 2.0
Sozzani, Franca.
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Portocarrero, Joaquin de 1681-1760
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unknown - Public Domain
Haven, Gilbert, 1821-1880
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Hans Holbein d. J. - Public Domain
Russell, John, Earl of Bedford, approximately 1485-1555
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Swetchine, Madame (Anne-Sophie), 1782-1857
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Lai Afong - Public Domain
Hirth, Friedrich, 1845-1927
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Parker, Quanah, 1845?-1911
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Hays, Alexander, 1819-1864
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unknown; scanned by myself - Public Domain
Williams, Griffith, 1769-1838
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Leslie Gottlieb - CC BY 2.0
Pickett, Bobby Boris
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unknown - Public Domain
Bunsen, Christian Karl Josias, Freiherr von, 1791-1860
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Grün, Karl, 1817-1887
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United States Congress - Public Domain
Alger, Bruce, 1918-
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Mueller, Otto, 1874-1930
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Nellie Van de Grift Sanchez - Public Domain
Stevenson, Fanny Van de Grift, 1840-1914
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פרס א.מ.ת - CC BY-SA 3.0
Talmi, Igal, 1925-....
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anonymous/unknown - Public Domain
Wassermann, August, 1866-1925
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unknown - Public Domain
Souter, David H., 1939-
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SUN RISE - Public Domain
Múzquiz, Melchor 1790-1844
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unknown - Public Domain
Phelps, Seth Ledyard, ?-1885
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unknown - Public Domain
Greenhow, Rose O'Neal, 1814-1864
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State Library of New South Wales collection -
Bainton, Edgar L. (Edgar Leslie), 1880-1956
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NASA - Public Domain
Spring, Sherwood C., 1944-
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Andrea Booher - Public Domain
Babauta, Juan N. (Juan Nekai), 1953-
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Homolka, Oscar, 1898-1978
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Halker, Bucky