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Matthisvalerie - CC BY-SA 4.0
David Shankbone - CC BY-SA 3.0
unknown - Public Domain
Federal Government of the United States - Public Domain
unidentified staff artist - Public Domain
BrokenSphere - CC BY-SA 3.0
PopCultureGeek.com - CC BY 2.0
Unbekannter Fotograf der Epoche. - Public Domain
Bastin - CC BY-SA 3.0
Nadar Upload and restoration by Jebulon - Public Domain
zeitgenössischer Stecher - Public Domain
*:File:Tdb-at-yellowstone-2002.jpg - CC BY-SA 3.0
Archivo de la Universidad Autónoma de Madrid - Public Domain
Rob Bogaerts / Anefo - CC BY-SA 3.0
user at project - Public Domain
No informado - Public Domain
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Matthisvalerie - CC BY-SA 4.0
Bailey, David A.
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David Shankbone - CC BY-SA 3.0
Bradford, Jesse
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Eaton, Daniel Cady, 1834-1895
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Maiden, J.H. (Joseph Henry), 1859-1925
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Carlyle, Thomas, 1795-1881
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unknown - Public Domain
Karaosmanoğlu, Yakup Kadri, 1889-1974
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Delahaye, Ernest, 1853-1930
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Edelman, Gerald M.
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Federal Government of the United States - Public Domain
York, Herbert F. (Herbert Frank)
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unidentified staff artist - Public Domain
Repp, Ed Earl, 1900-1979
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Bissell, Wilson Shannon, 1847-1903
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BrokenSphere - CC BY-SA 3.0
Chan, Ernie
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PopCultureGeek.com - CC BY 2.0
Darabont, Frank
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Heidenstam, Verner von 1859-1940
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Unbekannter Fotograf der Epoche. - Public Domain
Luschan, Felix von 1854-1924
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Doucet, Michael
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Ragaz, Leonhard, 1868-1945
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Bastin - CC BY-SA 3.0
Hannan, Daniel
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Malherbe, François de, 1555-1628
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Nadar Upload and restoration by Jebulon - Public Domain
Nélaton, Auguste, 1807-1873
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zeitgenössischer Stecher - Public Domain
Lambeck, Peter, 1628-1680
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Burnaby, Edwyn Sherard, 1830-1883
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*:File:Tdb-at-yellowstone-2002.jpg - CC BY-SA 3.0
Brock, Thomas D.
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Archivo de la Universidad Autónoma de Madrid - Public Domain
Barnes, H. F. (Horace Francis), 1903-1960
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Rob Bogaerts / Anefo - CC BY-SA 3.0
Wiesenthal, Simon, 1908-2005
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user at project - Public Domain
Brooks, Harvey, 1944-
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unknown - Public Domain
Pearson, Edmund Lester, 1880-1937
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No informado - Public Domain
Maffia, Pedro, 1899-1967
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unknown - Public Domain
Schenkendorf, Max von 1783-1817
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Cooper, Jackie, 1922-2011