Image from Wikimedia Commons
Wenzl Weis - Public Domain
Roger Highfield - CC BY-SA 4.0
self-scanned; photographer unknown - Public Domain
Angela George - CC BY-SA 3.0
unknown - Public Domain
Mathew Brady - Public Domain
Taken by Flickr user ioerror, Jacob Appelbaum - CC BY-SA 2.0
Jeno's - Public Domain
Public Domain
Secretaría de Cultura CDMX - CC BY-SA 2.0
New Georgia Encyclopedia - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
user at project - Public Domain
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Muhlenberg, Henry A. (Henry Augustus), 1823-1854
Image from Wikimedia Commons
Wenzl Weis - Public Domain
Bittner, Julius, 1874-1939
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Roger Highfield - CC BY-SA 4.0
Highfield, Roger.
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Winnington, Francis, Sir, 1634-1700
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Stone, Benjamin 1838-1914
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self-scanned; photographer unknown - Public Domain
Grenet, Eliseo, 1893-1950
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Tyler, John, 1790-1862
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Angela George - CC BY-SA 3.0
Leslie, Lisa, 1972-
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unknown - Public Domain
Stone, William A. (William Alexis), 1846-1920
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Thomas, Dave, 1949-
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Mathew Brady - Public Domain
Iverson, Alfred, 1798-1873
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Taken by Flickr user ioerror, Jacob Appelbaum - CC BY-SA 2.0
Dyson, Freeman J.
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Vermeer, Johannes, 1632-1675
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Jeno's - Public Domain
Baker, Ralph, 1942-
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Public Domain
Hansbrough, Henry Clay, 1848-1933
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unknown - Public Domain
Davids, Caroline A. F. Rhys (Caroline Augusta Foley Rhys), 1857-1942
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Secretaría de Cultura CDMX - CC BY-SA 2.0
Pacheco, José Emilio.
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Gershenzon, M. O. (Mikhail Osipovich), 1869-1925
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Bourguignat, Jules-René 1829-1892
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Davis, Leighton I. (Leighton Ira), 1910-1995
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Heijermans, Herman, 1864-1924
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Magni, Valeriano, 1587-1661
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Bénédite, Léonce, 1859-1925
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New Georgia Encyclopedia - Public Domain
Thompson, William Tappan, 1812-1882
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Mathew Brady Levin Corot Handy - Public Domain
Chipman, N. P. (Norton Parker), 1836-1924
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unknown - Public Domain
Murdoch, James, 1856-1921
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user at project - Public Domain
Carreras, José
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unknown - Public Domain
Bertrand, Joseph, 1822-1900
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Scobie, Ronald MacKenzie, 1893-1969
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Public Domain
Brannan, Charles F. (Charles Franklin), 1903-