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Bisto - CC BY-SA 3.0
United States Department of Labor - Public Domain
NN - Public Domain
Karl-Erik Olsson-Snogeröd - CC0 1.0
Gottschick (Kupferstecher 18./19. Jahrhundert). bibhai. - Public Domain
Rbiis5203 - CC BY-SA 4.0
original uploader - Public Domain
unknown - Public Domain
Stoddia93 - CC BY-SA 3.0
Dmitry_Rozhkov - CC BY 3.0
Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) - CC BY 3.0
Al pie de la imagen figuran los datos de su autor. - Public Domain
The Bureau of Industrial Service for CBS-TV. The Bureau was a division of ad agency Young & Rubicam and was widely used by networks, studios and program sponsors for distributing publicity materials. - Public Domain
Samhsa - Public Domain
Werewombat - CC BY-SA 3.0
anonymous - Public Domain
Hermann Walter (1838–1909) - Public Domain
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Bisto - CC BY-SA 3.0
Newell, Lloyd D., 1956-
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United States Department of Labor - Public Domain
Koontz, Elizabeth Duncan, 1919-1989
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NN - Public Domain
Barth, Christian Gottlob, 1799-1862
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Havergal, Frances Ridley, 1836-1879
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Karl-Erik Olsson-Snogeröd - CC0 1.0
Lewerentz, Sigurd, 1885-1975
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Gottschick (Kupferstecher 18./19. Jahrhundert). bibhai. - Public Domain
Heydenreich, Karl Heinrich, 1764-1801
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Škerjanc, Lucijan
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Rbiis5203 - CC BY-SA 4.0
Weiss, Thomas George.
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Böhm, Richard, 1854-1884
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Wilson, Huntington, 1875-
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original uploader - Public Domain
Idriess, Ion L. (Ion Llewellyn), 1890-1979
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Mihailo III, Prince of Serbia, 1823-1868
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Yates, Elizabeth, 1799-1860
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unknown - Public Domain
Reid, Hugh Logan, 1852 or 1853-1928
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Stoddia93 - CC BY-SA 3.0
Hicks, Peter, 1964-....
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Palacio, Valdés Armando 1853-1938
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Fonseca, Isaac Aboab da 1605-1693
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Masaoka, Shiki, 1867-1902
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Dmitry_Rozhkov - CC BY 3.0
Lungin, Pavel
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Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) - CC BY 3.0
Goldberger, Arthur Stanley, 1930-....
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Al pie de la imagen figuran los datos de su autor. - Public Domain
Torquemada, Juan de, 1388-1468
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The Bureau of Industrial Service for CBS-TV. The Bureau was a division of ad agency Young & Rubicam and was widely used by networks, studios and program sponsors for distributing publicity materials. - Public Domain
Bendix, William, 1906-1964
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Samhsa - Public Domain
San Giacomo, Laura, 1962-....
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Werewombat - CC BY-SA 3.0
Congregation Beth Israel (Portland, Or.)
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anonymous - Public Domain
Saunders, Marshall, 1861-1947
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Mendoza, Francisco de, -1566
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Hermann Walter (1838–1909) - Public Domain
Zweifel, Paul, 1848-1927
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Feyerabend, Paul, 1924-1994
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Comenius, Johann Amós, 1592-1670
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Heade, Martin Johnson, 1819-1904