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unknown - Public Domain
Anonymous - Public Domain
Stephencdickson - CC BY-SA 4.0
Glenn Strong - CC BY-SA 2.0
US Embassy Canada - CC BY 2.0
Public Domain
Project Gutenberg. - Public Domain
NARA-Author -
original uploader - Public Domain
original uploader - CC BY-SA 2.5
me - Public Domain
Courtesy of Archives & Special Collections, Columbia University Health Sciences Library - Public Domain
US Government printing Office (Washington, DC), publisher. - Public Domain
Peierls - CC BY-SA 3.0
Zeeshan313b - CC BY-SA 4.0
Pamelavazquezt - CC BY-SA 3.0
Jean-Auguste-Dominique Ingres - Public Domain
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unknown - Public Domain
Philbin, Eugene A. (Eugene Ambrose), 1857-1920
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Anonymous - Public Domain
Driscoll, Clara, 1861-1944
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Warburg, Fredric, 1898-
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unknown - Public Domain
Bell, Robert, 1841-1917
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Bouchaud, Émilie-Marie
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Stephencdickson - CC BY-SA 4.0
Alexander, Daniel Asher 1768-1846
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Clare, John, 1793-1864
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Glenn Strong - CC BY-SA 2.0
Stewart, Louis, 1944-
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US Embassy Canada - CC BY 2.0
Wilkerson, Lawrence B.
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Pulszky, Ferencz Aurelius, 1814-1897
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Public Domain
Unsoeld, Jolene, 1931-
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Project Gutenberg. - Public Domain
Fuller, Philo Case, 1787-1855
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NARA-Author -
Magruder, Jeb Stuart, 1934-....
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Public Domain
Pounds, Courtice
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Arctowski, Henryk, 1871-1958
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Dantine, Helmut
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original uploader - Public Domain
Robertson, Jerome Bonaparte, 1815-1890
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original uploader - CC BY-SA 2.5
Smith, Brendan, 1963-
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me - Public Domain
Stoddard, John L. (John Lawson), 1850-1931
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Littleton, Thomas, Sir, -1481
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Froud, Brian
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Courtesy of Archives & Special Collections, Columbia University Health Sciences Library - Public Domain
Spiegelman, Sol, 1914-1983.
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US Government printing Office (Washington, DC), publisher. - Public Domain
Hargis, Denver D. (Denver David), 1921-1989
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Swain, George Fillmore, 1857-1931
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Peierls - CC BY-SA 3.0
Kavanagh, Patrick, 1904-1967
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Secord, Richard V.
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Zeeshan313b - CC BY-SA 4.0
Qadir, Asghar
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original uploader - Public Domain
Sakharoff, Clotilde, 1892-1974
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Pamelavazquezt - CC BY-SA 3.0
Mosquera, Gerardo
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Jean-Auguste-Dominique Ingres - Public Domain
Delécluze, E. J. (Etienne Jean), 1781-1863