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unknown -
Olivier Strecker - CC BY-SA 3.0
Frederick Christian Lewis, after John Slater - Public Domain
unknown - Public Domain
E. Thöny - Public Domain
Thomas Fall (1833-1900) - Public Domain
*Jeff Goodman - CC BY-SA 3.0
Danacea https://www.flickr.com/photos/danacea/ - CC BY 2.0
Jrkruk -
Reproducción de un grabado de fines del siglo XIX, de autor no precisado - Public Domain
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ultomatt - CC BY 2.0
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original uploader - Public Domain
Low, Frederick Ferdinand, 1828-1894
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Cribb, Robert, 1805-1893
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Browning, Robert Wiedemann Barrett, 1849-1912
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Raschi, Vic, 1919-1988
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Olivier Strecker - CC BY-SA 3.0
MacColl, Catriona, 1954-....
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Brook, Timothy, 1951-....
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Lucas, Charles, 1713-1771
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Frederick Christian Lewis, after John Slater - Public Domain
Dudley, John William Ward, Earl of, 1781-1833
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Bland, Richard Parks, 1835-1899
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I'Ons, Frederick, 1802-1887
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Gertz, Jami
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unknown - Public Domain
Reid, Robert Raymond, 1789-1841
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Celsius, Magnus, 1621-1679
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E. Thöny - Public Domain
Thöny, Eduard 1866-1950
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Thomas Fall (1833-1900) - Public Domain
Allitsen, Frances, 1848-1912
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*Jeff Goodman - CC BY-SA 3.0
Goldstein, Al
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Saint-André, Jean-Bon, 1749-1813
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Danacea https://www.flickr.com/photos/danacea/ - CC BY 2.0
Harryhausen, Ray
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Lasaulx, Ernst von 1805-1861
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Powell, Don
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Jrkruk -
Seweryn, Andrzej
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Reproducción de un grabado de fines del siglo XIX, de autor no precisado - Public Domain
Grace, Michael Paul, 1842-1920
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Webb, Aileen Osborn, 1892-1979
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Canga Argüelles, José, 1770-1843
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Ogilvy, David, 1911-1999
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Van Wyck, Robert Anderson, 1849-1918
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Forsey, Eugene A. (Eugene Alfred), 1904-1991
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Leith, C. K. (Charles Kenneth), 1875-1956
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ultomatt - CC BY 2.0
Alden, Howard
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Occhialini, Giuseppe, 1907-1993.