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Gorupdebesanez - CC BY-SA 3.0
National Magazine - Public Domain
unknown - Public Domain
Ludwig Passini - Public Domain
Konrad Jacobs, Erlangen, Copyright is with MFO - CC BY-SA 2.0
U.S. Department of Energy - Public Domain
U.S. Army - Public Domain
Florian Hoffmann (FlHoffmann - CC BY-SA 4.0
Victor Talking Machine Company - Public Domain
U.S. Air Force - Public Domain
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Byrne, Oliver
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Gorupdebesanez - CC BY-SA 3.0
Kaufman, Philip, 1936-....
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Meredith, James Howard, 1933-
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National Magazine - Public Domain
Murray, W. H. H. (William Henry Harrison), 1840-1904
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Gebhardt, Eduard von 1838-1925
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unknown - Public Domain
Hay, Robert, 1799-1863
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Ludwig Passini - Public Domain
Mendelssohn-Bartholdy, Ernst von, 1846-1909
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Arledge, Roone
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Johnson, Robert S., 1920-1998
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Temkin, Owsei, 1902-2002
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unknown - Public Domain
Schilling, Johannes, 1828-1910
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Konrad Jacobs, Erlangen, Copyright is with MFO - CC BY-SA 2.0
Debreu, Gerard
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Wagner, Richard, 1813-1883
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Bland, James A.
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U.S. Department of Energy - Public Domain
Szilard, Leo
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Barringer, Daniel Moreau, 1806-1873
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Tebbetts, Birdie, 1912-1999
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U.S. Army - Public Domain
Gregory, Edmund B. (Edmund Bristol), 1882-1961
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Florian Hoffmann (FlHoffmann - CC BY-SA 4.0
Johnson, Holly, 1960-
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Blanco, Andrés Eloy (1898-1955).
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Gilman, Elisabeth Coit, 1867-1950
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Bradford, William, 1729-1808
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Lance, Bert, 1931-2013
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Victor Talking Machine Company - Public Domain
Carter, Sara, 1898-1979
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unknown - Public Domain
Moholy-Nagy, László, 1895-1946
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Gregg, John Robert, 1867-1948
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Bürger, Gottfried August, 1747-1794
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U.S. Air Force - Public Domain
Mathis, Robert C., 1927-
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Willigen, Adriaan van der 1766-1841
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Waghorn, Thomas, 1800-1850