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unknown - Public Domain
Eva Rinaldi - CC BY-SA 2.0
U.S. Air Force - Public Domain
Federal Reserve Bank of Chicago - Public Domain
original uploader - Public Domain
Eric Antoniou - CC BY 2.0
Trailer to 1959 film House on Haunted Hill - Public Domain
Compiled by William Darlington, M.D., illustrator not listed - Public Domain
Jeremiah van der Eyden - Public Domain
Ji-Elle - CC BY-SA 3.0
Elaine B. Mitchell (editor) - Public Domain
Mathew Brady - Public Domain
Royal Society Portraits - Public Domain
Karl Gottfried Brunotte -
Hoppyh - CC BY-SA 4.0
Unidentified (Ensian published by University of Michigan) - Public Domain
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Clavière, Étienne, 1735-1793
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Jemnitz, Sándor, 1890-1963
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Purdom, Edmund, 1924-2009
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Randolph, Vance, 1892-1980
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unknown - Public Domain
Cummings, Irving, 1888-1959
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Eva Rinaldi - CC BY-SA 2.0
Monahan, Pat
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Bonheur, Rosa, 1822-1899
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U.S. Air Force - Public Domain
Dixon, Robert J. (Robert James), 1920-2003
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Federal Reserve Bank of Chicago - Public Domain
Moskow, Michael H.
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Fubini, Guido, 1879-1943
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unknown - Public Domain
Nowak, Jan, 1913-2005
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Mulcahy, Richard, 1886-1971
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Gusmão, Alexandre de, 1695-1753
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original uploader - Public Domain
O'Neill, Henry, 1891-1961
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Burton, William E. (William Evans), 1802-1860
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Henry, Robert, 1718-1790
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Eric Antoniou - CC BY 2.0
McGovern, Maureen
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Frank, Johann Peter, 1745-1821
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Wyttenbach, Daniel Albert, 1746-1820
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Trailer to 1959 film House on Haunted Hill - Public Domain
Ohmart, Carol, 1927-
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Compiled by William Darlington, M.D., illustrator not listed - Public Domain
Baldwin, William, 1779-1819
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Lentulov, Aristarkh Vasilʹevich, 1882-1943
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Jeremiah van der Eyden - Public Domain
Rutland, Henry Manners, Earl of, 1526-1563
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Ji-Elle - CC BY-SA 3.0
Quint, Michel, 1949-....
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Elaine B. Mitchell (editor) - Public Domain
Egan, William A.
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Mathew Brady - Public Domain
Collins, Edward Knight, 1802-1878
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Royal Society Portraits - Public Domain
Fréchette, Louis Honoré, 1839-1908
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Karl Gottfried Brunotte -
Brunotte, Karl Gottfried, 1958-
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Hoppyh - CC BY-SA 4.0
Harrison, J. Hartwell (John Hartwell), 1909-1984
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Unidentified (Ensian published by University of Michigan) - Public Domain
Hamada, Shōji, 1894-1978