Image from Wikimedia Commons
Allan warren - CC BY-SA 3.0
Unattributed - Public Domain
Samuel Hart - Public Domain
Al Ravenna - Public Domain
Public Domain
US Government staff photographer, scanned and cropped by uploader - Public Domain
Works made for hire - Public Domain
National Ground Water Association - CC BY 2.5
Joseph Boze - Public Domain
film studio publicity still. - Public Domain
User Sannse -
Andymiah - CC BY-SA 3.0
original uploader -
Image from Wikimedia Commons
Allan warren - CC BY-SA 3.0
Kerr, Deborah, 1921-2007
Image from Wikimedia Commons
Unattributed - Public Domain
Jambor, Agi, 1909-1997
Image from Wikimedia Commons
Samuel Hart - Public Domain
Roots, Logan Herbert, Bishop, 1870-1945
Image from Wikimedia Commons
Standley, William Harrison, 1872-1963
Image from Wikimedia Commons
Roger, Henri, 1860-1946
Image from Wikimedia Commons
Al Ravenna - Public Domain
Apgar, Virginia, 1909-1974
Image from Wikimedia Commons
Public Domain
Howard, Benjamin, 1760-1814
Image from Wikimedia Commons
Chadwick, Helene
Image from Wikimedia Commons
Page, Earle, 1880-1961
Image from Wikimedia Commons
Grant, Heber J. (Heber Jeddy), 1856-1945
Image from Wikimedia Commons
US Government staff photographer, scanned and cropped by uploader - Public Domain
Desobry, William R. (William Robertson), 1918-
Image from Wikimedia Commons
Brewster, Daniel Baugh, 1923-2007
Image from Wikimedia Commons
Kirchner, Theodor, 1823-1903
Image from Wikimedia Commons
Works made for hire - Public Domain
Lyman, Richard Roswell, 1870-1963
Image from Wikimedia Commons
National Ground Water Association - CC BY 2.5
Abriola, Linda M., 1954-....
Image from Wikimedia Commons
Dandini, Cesare, 1596-1658
Image from Wikimedia Commons
Joseph Boze - Public Domain
Barnave, Antoine, 1761-1793
Image from Wikimedia Commons
film studio publicity still. - Public Domain
Milestone, Lewis, 1895-1980
Image from Wikimedia Commons
User Sannse -
McMath, Sid
Image from Wikimedia Commons
Black, Samuel W., 1818-1862
Image from Wikimedia Commons
Brunetìere, Ferdinand, 1849-1906
Image from Wikimedia Commons
Adler, Victor, 1852-1918
Image from Wikimedia Commons
Public Domain
Treviño, Jacinto B. 1883-1971
Image from Wikimedia Commons
Unattributed - Public Domain
Maréchal, Maurice, 1892-1964
Image from Wikimedia Commons
Rice, Florence, 1911-1974
Image from Wikimedia Commons
Deniker, Joseph, 1852-1918
Image from Wikimedia Commons
Andymiah - CC BY-SA 3.0
Katz, Elihu, 1926-....
Image from Wikimedia Commons
McWherter, Ned R., 1930-2011
Image from Wikimedia Commons
original uploader -
Hiegel, Hans Robert
Image from Wikimedia Commons
Carnera, Primo, 1906-1967