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anonymous - Public Domain
Hoveros - CC BY-SA 4.0
Ettinger Company for the television program ''Climax!'' - Public Domain
Library of the London School of Economics and Political Science -
Heironymous Rowe - CC BY-SA 3.0
Maine State Museum - Public Domain
Hans Weiss - CC BY-SA 3.0
Joseph Williamson, author. Long, Short and Harmon (Portland, ME), publisher. - Public Domain
Boberger - CC BY 3.0
Public Domain
Maull and Fox - Public Domain
National Book League (Great Britain) - Public Domain
Nv8200p - CC BY-SA 3.0
Courtesy of Horowhenua Historical Society inc, Levin, New Zealand - CC BY-SA 3.0
Vdevanthery - CC BY-SA 3.0
NASA - Public Domain
George Cruikshank (27 September 1792 – 1 February 1878) - Public Domain
Joseguztorres - CC BY-SA 3.0
nicogenin - CC BY-SA 2.0
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anonymous - Public Domain
Loftus, William Kennett
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Hayward, A. (Abraham), 1801-1884
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Bukovac, Vlaho, 1855-1922
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Ribeiro, Darcy.
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Hoveros - CC BY-SA 4.0
Charles, Robert B.
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Ettinger Company for the television program ''Climax!'' - Public Domain
Kerr, John, 1931-2013
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Library of the London School of Economics and Political Science -
Lapenna, Ivo
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Heironymous Rowe - CC BY-SA 3.0
Fran, Carol, 1933-
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Maine State Museum - Public Domain
Williams, Reuel, 1783-1862
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Timmermans, Felix, 1886-1947
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Newbolt, Henry John, Sir, 1862-1938
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Hans Weiss - CC BY-SA 3.0
Weiss, Hans, 1950-
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Cotta, Johann Friedrich, Freiherr von, 1764-1832
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Joseph Williamson, author. Long, Short and Harmon (Portland, ME), publisher. - Public Domain
Crosby, William George, 1805-1881
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Boberger - CC BY 3.0
Saʻdāwī, Nawāl
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Public Domain
Mountain, George J. (George Jehoshaphat), 1789-1863
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Maull and Fox - Public Domain
Maude, Stanley, Sir, 1864-1917
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Murphy, William J. (William John), 1839-1923
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Hogan, John, 1800-1858
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National Book League (Great Britain) - Public Domain
Scudder, Horace Elisha, 1838-1902
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Nv8200p - CC BY-SA 3.0
Perrotta, Tom, 1961-...
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Coombs, H.C. (Herbert Cole), 1906-
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Courtesy of Horowhenua Historical Society inc, Levin, New Zealand - CC BY-SA 3.0
Lange, David, 1942-2005
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Vdevanthery - CC BY-SA 3.0
Amiguet, Jean-François, 1950-....
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NASA - Public Domain
Chang-Díaz, Franklin R., 1950-
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Public Domain
McMahon, Audrey, 1900?-1981
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George Cruikshank (27 September 1792 – 1 February 1878) - Public Domain
Grimaldi, Joseph, 1779-1837
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Joseguztorres - CC BY-SA 3.0
Cazals, Felipe, 1937-....
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Bilbo, Theodore Gilmore, 1877-1947
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nicogenin - CC BY-SA 2.0
Arnault, Bernard, 1949-....