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U.S. Air Force - Public Domain
New York, N.Y. : M. King - Public Domain
unknown - Public Domain
uncredited staff artist - Public Domain
Artur Pawłowski - CC BY-SA 4.0
Fin Serck-Hanssen - CC BY 3.0
Public Domain
Wrathdemon - CC BY-SA 4.0
Hubertl Credit line - CC BY-SA 4.0
user at project - Public Domain
John Faber, Jr., 1732 - Public Domain
Field, R; Cook, Henry R.; Gold, Joyce - Public Domain
The Phonoscope - Public Domain
Caspar Netscher - Public Domain
FunkyCanute - CC BY-SA 3.0
E-paprykarz -
U.S. Department of Energy - Public Domain
Pinikadia - CC0 1.0
David Bowers - Public Domain
Joel Rickenbach - CC BY-SA 2.0
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U.S. Air Force - Public Domain
Dixon, Robert J. (Robert James), 1920-2003
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New York, N.Y. : M. King - Public Domain
Congdon, Henry Martyn, 1834-1922
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unknown - Public Domain
Field, Kate, 1838-1896
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uncredited staff artist - Public Domain
Pratt, Fletcher, 1897-1956
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Artur Pawłowski - CC BY-SA 4.0
Miłosz, Czesław
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Lindbergh, Charles A. (Charles Augustus), 1902-1974
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Cobham, William Brooke, Baron, 1527-1597
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Shorter, Clement King, 1857-1926
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Preller, Gustav Schoeman, 1875-1943
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Fin Serck-Hanssen - CC BY 3.0
Maurstad, Toralv
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Public Domain
Pitman, Robert C. (Robert Carter), 1825-1891
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Hare, James, 1747?-1804
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Wrathdemon - CC BY-SA 4.0
Ball, Ernest R., 1878-1927
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Hubertl Credit line - CC BY-SA 4.0
Schlosser, Julius, Ritter von, 1866-1938
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user at project - Public Domain
Jaynes, E. T. (Edwin T.)
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John Faber, Jr., 1732 - Public Domain
Cheyne, George, 1671 or 1672-1743
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Field, R; Cook, Henry R.; Gold, Joyce - Public Domain
Shortland, John, 1769-1810
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The Phonoscope - Public Domain
Spencer, Len, 1867-1914
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Caspar Netscher - Public Domain
Hartsoeker, Nicolas, 1656-1725
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FunkyCanute - CC BY-SA 3.0
Guest, Ivor Forbes.
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Stephenson, John Gould, 1828-1883
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E-paprykarz -
Schulz, Bruno, 1892-1942
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Pingoud, Ernest
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U.S. Department of Energy - Public Domain
Szilard, Leo
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Pinikadia - CC0 1.0
Christensen, Benjamin, 1879-1959
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Pomerene, Atlee, 1863-1937
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David Bowers - Public Domain
Henderson, Lucius
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Joel Rickenbach - CC BY-SA 2.0
Hicks, Catherine, 1951-
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Balzac, Honoré de, Madame, approximately 1800-1881 or 1882
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Pelt, R.J. van (Robert Jan), 1955-