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various - Public Domain
jhritz - CC BY 2.0
Unknown author - Public Domain
unknown - Public Domain
W. W. Foster - Public Domain
Georges Biard - CC BY-SA 3.0
El dibujo original es de David Lozano (artista peruano fallecido en 1936). - Public Domain
Lawson Speedway - CC BY-SA 4.0
Public Domain
US Government Printing Office (Washington, DC). - Public Domain
Jim.henderson - CC0 1.0
Bichin01 - Public Domain
Opus88888 - CC BY-SA 3.0
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various - Public Domain
Burns, E. L. M. (Eedson Louis Millard), 1897-1985
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Quillan, Eddie, 1907-1990
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Fabricius, ab Aquapendente, approximately 1533-1619
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jhritz - CC BY 2.0
Turrell, James
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Whittaker, E. T. (Edmund Taylor), 1873-1956
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Unknown author - Public Domain
Longfellow, A. W. (Alexander Wadsworth), 1854-1934
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unknown - Public Domain
Liddell, St. John Richardson
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W. W. Foster - Public Domain
Byrd, Richard Evelyn, 1860-1925
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Preer, Evelyn
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Conrad, T. A. (Timothy Abbott), 1803-1877
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Georges Biard - CC BY-SA 3.0
Delon, Alain, 1935-....
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Raynolds, W. F. (William Franklin), 1820-1894
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Ruiz Soler, Antonio, 1921-1996
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El dibujo original es de David Lozano (artista peruano fallecido en 1936). - Public Domain
Riva-Aguero, José de la 1783-1858
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Foote, Samuel, 1720-1777
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Lawson Speedway - CC BY-SA 4.0
Cooper, Bob, 1950-
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Public Domain
Monckton, Lionel, 1861-1924
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unknown - Public Domain
Lewis, John L. (John Llewellyn), 1880-1969
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US Government Printing Office (Washington, DC). - Public Domain
Beamer, John V. (John Valentine), 1896-1964
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Public Domain
Pearson, John A. (John Andrew), 1867-1940
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Jim.henderson - CC0 1.0
Poppenhusen, Conrad, 1818-1883
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unknown - Public Domain
Orr, Alexander Ector, 1831-1914
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Lederman, Leon M.
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Lenau, Nicolaus, 1802-1850
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Masur, Richard
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Kennedy, Alex. B. W. (Alexander Blackie William), 1847-1928
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Bichin01 - Public Domain
Castro Ruz, Juanita, 1933-
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Opus88888 - CC BY-SA 3.0
Tyāgarāja, Swāmi, 1767-1847
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Macdonald, J. H. A. (John Hay Athole), 1836-1919
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Peale, Charles Willson, 1741-1827