Image from Wikimedia Commons
Charles Willson Peale (1741-1827) - Public Domain
Bdavis1531 - CC BY-SA 3.0
Public Domain
Léon Ruffé - Public Domain
Gage Skidmore - CC BY-SA 3.0
Mathew Brady - Public Domain
unknown - Public Domain
unknown photographer - CC BY-SA 3.0
USMC - Public Domain
Swerling - CC BY-SA 4.0
Joan Halifax - CC BY 2.0
Mathew Brady Levin Corot Handy - Public Domain
Studio Émile Rat, Poitiers - Public Domain
Image from Wikimedia Commons
Furman, Richard, 1755-1825
Image from Wikimedia Commons
Cronin, A.J. (Archibald Joseph), 1896-1981
Image from Wikimedia Commons
Linde, A. D.
Image from Wikimedia Commons
Charles Willson Peale (1741-1827) - Public Domain
Sevier, John, 1745-1815
Image from Wikimedia Commons
Murray, Bruce C.
Image from Wikimedia Commons
Bdavis1531 - CC BY-SA 3.0
Snelling, Richard Arkwright, 1927-1991
Image from Wikimedia Commons
Public Domain
Winchester, Sarah Pardee, 1837-1922
Image from Wikimedia Commons
Léon Ruffé - Public Domain
Pressensé, Francis de, 1853-1914
Image from Wikimedia Commons
Gage Skidmore - CC BY-SA 3.0
Steinberg, Hank
Image from Wikimedia Commons
Sacro Bosco, Joannes de, active 1230
Image from Wikimedia Commons
Mathew Brady - Public Domain
Abercrombie, John Joseph, 1798-1877
Image from Wikimedia Commons
unknown - Public Domain
Jiang, Wenye, 1910-1983
Image from Wikimedia Commons
Corrigan, Ray, 1902-1976
Image from Wikimedia Commons
Coates, Edward H. (Edward Honor), 1846-1921
Image from Wikimedia Commons
Mitten, William, 1819-1906
Image from Wikimedia Commons
unknown photographer - CC BY-SA 3.0
Abiola, M. K. O. (Moshood Kashimawo Olawale), 1937-
Image from Wikimedia Commons
Bohnen, Michael
Image from Wikimedia Commons
USMC - Public Domain
Holcomb, Thomas, 1879-1965
Image from Wikimedia Commons
unknown - Public Domain
Lincoln, Joseph Crosby, 1870-1944
Image from Wikimedia Commons
Hamilton, William Hamilton, Duke of, 1616-1651
Image from Wikimedia Commons
Helps, Arthur, sir, 1813-1875
Image from Wikimedia Commons
Public Domain
Conrad, Frank, 1874-1941
Image from Wikimedia Commons
Eliot, George, 1819-1880
Image from Wikimedia Commons
Swerling - CC BY-SA 4.0
Swerling, Jo, 1897-1964
Image from Wikimedia Commons
Joan Halifax - CC BY 2.0
Ram Dass
Image from Wikimedia Commons
unknown - Public Domain
Pearson, Karl, 1857-1936
Image from Wikimedia Commons
Martin, Jesse L.
Image from Wikimedia Commons
Mathew Brady Levin Corot Handy - Public Domain
Kernan, Francis, 1816-1892
Image from Wikimedia Commons
Glimm, James.
Image from Wikimedia Commons
Studio Émile Rat, Poitiers - Public Domain
Lekeu, Guillaume, 1870-1894