Image from Wikimedia Commons
"Mishkin Photo" (Bain News Service, publisher) - Public Domain
Missouri Botanical Garden - Public Domain
anonymous - Public Domain
US Government - Public Domain
US Government Printing Office - Public Domain
Domenico Corvi - Public Domain
United States Navy photograph - Public Domain
William Lee Hankey - Public Domain
see below - Public Domain
Harris & Ewing, photographer - Public Domain
P. Krieger - Public Domain
Public Domain
J. B. Lyon Company (Albany, NY), publisher. - Public Domain
*Jeff Goodman - CC BY-SA 3.0
Blaues Sofa - CC BY 2.0
Image from Wikimedia Commons
"Mishkin Photo" (Bain News Service, publisher) - Public Domain
Melis, Carmen, 1885-1967
Image from Wikimedia Commons
Salerno, Shane
Image from Wikimedia Commons
Dickey, Henry L. (Henry Luther), 1832-1910
Image from Wikimedia Commons
Missouri Botanical Garden - Public Domain
Shaw, Henry, 1800-1889
Image from Wikimedia Commons
anonymous - Public Domain
Jastrow, Joseph, 1863-1944
Image from Wikimedia Commons
US Government - Public Domain
Jackson, William H. (William Harding), 1901-1971
Image from Wikimedia Commons
US Government Printing Office - Public Domain
McFall, John J.
Image from Wikimedia Commons
Leidy, Paul, 1813-1877
Image from Wikimedia Commons
Malik, Charles Habib, 1906-1987
Image from Wikimedia Commons
Webb, C. Locock (Charles Locock), 1822-1898
Image from Wikimedia Commons
Bohr, Aage.
Image from Wikimedia Commons
Erizzo, Francesco 1566-1646
Image from Wikimedia Commons
Domenico Corvi - Public Domain
Marescotti, Hyacintha, Saint, 1585-1640
Image from Wikimedia Commons
Pelham, John Thomas, 1811-1894
Image from Wikimedia Commons
Skinner, William, 1700-1780
Image from Wikimedia Commons
Davis, Mildred, 1900?-1969
Image from Wikimedia Commons
Blumenbach, Johann Friedrich, 1752-1840
Image from Wikimedia Commons
United States Navy photograph - Public Domain
Melson, Charles D.
Image from Wikimedia Commons
William Lee Hankey - Public Domain
Lee-Hankey, William, 1869-1952
Image from Wikimedia Commons
Curran, Joseph Edwin, 1906-1981
Image from Wikimedia Commons
see below - Public Domain
Piasecki, Frank N.
Image from Wikimedia Commons
Harris & Ewing, photographer - Public Domain
Harding, W. P. G. (William Proctor Gould), 1864-1930
Image from Wikimedia Commons
P. Krieger - Public Domain
Pohl, Richard (1826-1896).
Image from Wikimedia Commons
Public Domain
Gause, Lucien Coatsworth, 1836-1880
Image from Wikimedia Commons
J. B. Lyon Company (Albany, NY), publisher. - Public Domain
Bennett, John J. (John James), 1894-1967
Image from Wikimedia Commons
Inagaki, Manjirō 1861-1908
Image from Wikimedia Commons
Alberti, Leon Battista, 1404-1472
Image from Wikimedia Commons
Zamenhof, L. L. (Ludwik Lazar), 1859-1917
Image from Wikimedia Commons
*Jeff Goodman - CC BY-SA 3.0
Goldstein, Al
Image from Wikimedia Commons
Blaues Sofa - CC BY 2.0
Begley, Louis