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Frederick Hollyer - Public Domain
Copyright owned by subject as a result of a work-for-hire arrangement - CC BY-SA 3.0
unknown - Public Domain
US gov - Public Domain
Public Domain
University of Houston Digital Library -
United States Government - Public Domain
Mervyn - Public Domain
Joi Ito - CC BY 2.0
Mathew Brady - Public Domain
Not stated - Public Domain
Jon Hanna - CC BY-SA 3.0
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Baldwin, James Mark, 1861-1934
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Whitney, Orson F. (Orson Ferguson), 1855-1931
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Frederick Hollyer - Public Domain
Mackail, J. W. (John William), 1859-1945
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Perkin, William Henry, Sir, 1838-1907
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Copyright owned by subject as a result of a work-for-hire arrangement - CC BY-SA 3.0
Kusatsu, Clyde 1948-....
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unknown - Public Domain
Ångström, Knut, 1857-1910
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US gov - Public Domain
Bradley, Stephen Row, 1754-1830
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Levitan, Steven
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Nesmith, Michael
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Public Domain
Duke, James Buchanan, 1856-1925
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University of Houston Digital Library -
Lopate, Phillip
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United States Government - Public Domain
Kessler, Gladys, 1938-
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Mervyn - Public Domain
Smith, Madeleine Hamilton, 1835-1928
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unknown - Public Domain
Sweet, Henry, 1845-1912
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Williams, Esther, 1921-2013
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Oberdan, Guglielmo, 1858-1882
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McKim, Isaac, 1775-1838
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Turney, Peter, 1827-1903
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Joi Ito - CC BY 2.0
Varian, Hal R.
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Anderson Stuart, Thomas Peter, 1856-1920
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Mathew Brady - Public Domain
Hoe, Richard March, 1812-1886
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Jadassohn, Salomon, 1831-1902
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Not stated - Public Domain
Thomas, William Isaac, 1863-1947
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Public Domain
Neale, J.M. (John Mason), 1818-1866
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Cronauer, Adrian
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Boury, Robert, 1946-
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Cooke, Morris Llewellyn, 1872-1960
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unknown - Public Domain
Fairlie, John A. (John Archibald), 1872-1947
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unknown - Public Domain
Garvin, Michael J., 1861-1918
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Jon Hanna - CC BY-SA 3.0
McKenna, Terence K., 1946-....