Image from Wikimedia Commons
Lewis Smith (photo credit) - Public Domain
KitMarlowe3 - Public Domain
Smithsonian Institution -
unknown - Public Domain
NBC Radio - Public Domain
unknown -
Joi - CC BY 2.5
not credited - Public Domain
Fritz Stuckenberg - Public Domain
Trphira - CC BY-SA 3.0
City of Boston Archives - CC BY 2.0
Henk Lindeboom / Anefo -
unknown - CC BY-SA 4.0
Justin (aka Jsteinfan) -
The National Archives UK -
Waldon Fawcett - Public Domain
Contemporary portrait - Public Domain
Köhler - Public Domain
Maynard Dixon - Public Domain
BurnAway - CC BY 2.0
Image from Wikimedia Commons
Lewis Smith (photo credit) - Public Domain
Warner, H. B. (Henry Byron), 1876-1958
Image from Wikimedia Commons
Richardson, H. H. (Henry Hobson), 1838-1886
Image from Wikimedia Commons
Quartero, Nina, 1908-1985
Image from Wikimedia Commons
KitMarlowe3 - Public Domain
Huson, Paul
Image from Wikimedia Commons
Smithsonian Institution -
Mather, Kirtley F. (Kirtley Fletcher), 1888-1978
Image from Wikimedia Commons
Heinlein, Robert A. (Robert Anson), 1907-1988
Image from Wikimedia Commons
unknown - Public Domain
Walker, William Henry Talbot, 1816-1864
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Armstrong, Anne Legendre, 1927-2008
Image from Wikimedia Commons
NBC Radio - Public Domain
Lewis, Forrest, 1899-1977
Image from Wikimedia Commons
unknown -
Cremona, Tranquillo, 1837-1878
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Douglass, Frederick, 1818-1895
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Page, David P. (David Perkins), 1810-1848
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Clarke, John D. (John Davenport), 1873-1933
Image from Wikimedia Commons
Soxhlet, Franz von
Image from Wikimedia Commons
Joi - CC BY 2.5
Stern, Andy, 1950-
Image from Wikimedia Commons
not credited - Public Domain
Bright, Jacob, 1821-1899
Image from Wikimedia Commons
Fritz Stuckenberg - Public Domain
Stuckenberg, Fritz, 1881-1944
Image from Wikimedia Commons
Trphira - CC BY-SA 3.0
Herseth, Adolph
Image from Wikimedia Commons
City of Boston Archives - CC BY 2.0
Harris, Richard, 1930-2002
Image from Wikimedia Commons
Henk Lindeboom / Anefo -
Rudolph, Wilma, 1940-....
Image from Wikimedia Commons
unknown - CC BY-SA 4.0
Spencer, William Robert, 1769-1834
Image from Wikimedia Commons
Justin (aka Jsteinfan) -
Steinman, Jim
Image from Wikimedia Commons
The National Archives UK -
Rutter, Owen, 1889-1944
Image from Wikimedia Commons
Waldon Fawcett - Public Domain
Chanute, Octave, 1832-1910
Image from Wikimedia Commons
Contemporary portrait - Public Domain
Hare, Julius Charles, 1795-1855
Image from Wikimedia Commons
Köhler - Public Domain
Köhler, Ernesto, 1849-1907
Image from Wikimedia Commons
Maynard Dixon - Public Domain
Dixon, Maynard, 1875-1946
Image from Wikimedia Commons
Simpson, Helen, 1897-1940
Image from Wikimedia Commons
BurnAway - CC BY 2.0
Greenberg, Jill
Image from Wikimedia Commons
Gandolfi, Gaetano, 1734-1802