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SMU Central University Libraries -
Unknown Oberthur collection - Public Domain
Mathew Brady - Public Domain
Ralph Alswang - Public Domain
Painted by T. Beach Engraved by P. Roberts - Public Domain
Henk Lindeboom / Anefo -
Inside TWiT - CC BY-SA 2.0
Melissa Eagan, WNYC New York Public Radio - CC BY 2.0
Lewis Smith (photo credit) - Public Domain
Daniel Läpple - Public Domain
The U.S. National Archives -
not credited - Public Domain
unknown - Public Domain
Charles Bird King - Public Domain
Original: Astronomical Institute, Academy of Sciences of the Czech Republic. - CC BY-SA 2.5
Blmurch - CC BY 3.0
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Wexler, Robert, 1961-
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Linde, A. D.
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Fulci, Lucio
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Rosenthal, Barbara, 1948-
Image from Wikimedia Commons
SMU Central University Libraries -
McCarthy, Carlton, 1847-1936
Image from Wikimedia Commons
Thomas, Sidney Gilchrist, 1850-1885
Image from Wikimedia Commons
Unknown Oberthur collection - Public Domain
Guenée, A. (Achille), 1809-1880
Image from Wikimedia Commons
Mathew Brady - Public Domain
Granger, Gordon, 1822-1876
Image from Wikimedia Commons
Ralph Alswang - Public Domain
Iacocca, Lee A.
Image from Wikimedia Commons
Painted by T. Beach Engraved by P. Roberts - Public Domain
Pulteney, Richard, 1730-1801
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Henk Lindeboom / Anefo -
Rudolph, Wilma, 1940-....
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Watkins, James D., 1927-2012
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Inside TWiT - CC BY-SA 2.0
Debartolo, Dick
Image from Wikimedia Commons
Melissa Eagan, WNYC New York Public Radio - CC BY 2.0
Matthiessen, Peter.
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Lewis Smith (photo credit) - Public Domain
Warner, H. B. (Henry Byron), 1876-1958
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Daniel Läpple - Public Domain
Delbrück, M. (Max), 1850-1919
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The U.S. National Archives -
McCall, Tom, 1913-1983
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not credited - Public Domain
Bernstein, Eduard, 1850-1932
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Viera y Clavijo, José de, 1731-1813
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Stone, S. J. (Samuel John), 1839-1900
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Lemke, William, 1878-1950
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unknown - Public Domain
Lyons, James, 1801-1882
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Boileau, Gerald J.
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Roper, Margaret, 1505-1544
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Charles Bird King - Public Domain
Hunter, William, 1774-1849
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Original: Astronomical Institute, Academy of Sciences of the Czech Republic. - CC BY-SA 2.5
Ekers, R. D. (Ron D.)
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Ross, Denman Waldo, 1853-1935
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Parsons, William Barclay, 1859-1932
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unknown - Public Domain
White, David, 1862-1935
Image from Wikimedia Commons
Blmurch - CC BY 3.0
Murch, Walter Scott, 1943-