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The Safety Press - Public Domain
avlxyz - CC BY-SA 2.0
Frantogian - CC BY-SA 3.0
The Nobel Foundation - Public Domain
Thomas William Herringshaw, author. Published by American Publishers' Association, Chicago. - Public Domain
Toni Frissell - Public Domain
(see description) - Public Domain
Eric Koch / Anefo - CC0 1.0
Unknown - Public Domain
unknown - Public Domain
United States Air Force - Public Domain
U.S. Government Printing Office - Public Domain
Lithographie von Sprick nach Zeichnung von F.Krüger - Public Domain
Ianthus - CC BY-SA 4.0
Photograph - Public Domain
Machahn - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
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The Safety Press - Public Domain
Irving, Mary Jane, 1914-
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avlxyz - CC BY-SA 2.0
Stein, Rick
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Starr, Kenneth, 1946-
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Mysliveček, Josef, 1737-1781
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Frantogian - CC BY-SA 3.0
Chazel, Marie-Anne
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The Nobel Foundation - Public Domain
Minot, George Richards, 1885-1950
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Horneman, C.F.E. (Christian Frederik Emil), 1840-1906
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Thomas William Herringshaw, author. Published by American Publishers' Association, Chicago. - Public Domain
Ray, George W. (George Washington), 1844-1925
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Jones, Gemma
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Toni Frissell - Public Domain
Todd, Michael, 1909-1958
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(see description) - Public Domain
Lawrence, Henry Montgomery, Sir, 1806-1857
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Villari, Pasquale, 1827-1917
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Ingarden, Roman, 1893-1970
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Cutler, Walter Leon, 1931-
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Eric Koch / Anefo - CC0 1.0
Kovacevich, Stephen, 1940-....
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Massey, William, 1809-1881
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Servetus, Michael, 1511?-1553
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Unknown - Public Domain
Rosenheim, Alfred F. (Alfred Faist), 1859-1943
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unknown - Public Domain
Wilson, Arnold Talbot, Sir, 1884-1940
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Tipu Sultan, Fath ʻAli, Nawab of Mysore, 1753-1799
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unknown - Public Domain
Rives, Alfred Landon, 1830-1903
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Craddock, Ida C.
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United States Air Force - Public Domain
Eielson, Carl Benjamin, 1897-1929
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Beymer, Richard, 1939-....
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U.S. Government Printing Office - Public Domain
Kupferman, Theodore R.
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Lithographie von Sprick nach Zeichnung von F.Krüger - Public Domain
Tieck, Friedrich, 1776-1851
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Ianthus - CC BY-SA 4.0
Nash, Marilyn
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Photograph - Public Domain
Strawn, Silas Hardy, 1866-1946
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Machahn - Public Domain
Heydt, August von der 1801-1874
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Mathew Brady Levin Corot Handy - Public Domain
Green, Duff, 1791-1875