Image from Wikimedia Commons
unknown - Public Domain
user at project - Public Domain
Stephen Lewellyn - Public Domain
United States Senate Historical Office - Public Domain
Unknown (Bain News Service, publisher) - Public Domain
Bibliothèque et Archives nationales - Beaudry, Québec - Public Domain
Civil War Photograph Collection, Library of Congress - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Daniel Mietchen - CC0 1.0
W.J. Parry - Public Domain
Moshe Milner - Public Domain
Haemmerli - CC BY-SA 3.0
unknown photographer - Public Domain
William Marshall 1920 - Public Domain
Not stated - Public Domain
William J. Meuer Photoart Collection - Public Domain
Senior Airman James C. Dillard; cropped by Blueag9. - Public Domain
Image from Wikimedia Commons
Aguirre, Hank, 1931-1994
Image from Wikimedia Commons
Lavenu, Louis Henry, 1818-1859
Image from Wikimedia Commons
Wittich, Christoph, 1625-1687
Image from Wikimedia Commons
unknown - Public Domain
Behan, John Harris, 1845-1912
Image from Wikimedia Commons
user at project - Public Domain
Ruskaja, Jia, 1902-1970
Image from Wikimedia Commons
Stephen Lewellyn - Public Domain
Mentschikoff, Soia, 1915-....
Image from Wikimedia Commons
Hoth, Hermann, 1885-1971
Image from Wikimedia Commons
Duhamel du Monceau, M., 1700-1782
Image from Wikimedia Commons
United States Senate Historical Office - Public Domain
Eppes, John Wayles, 1773-1823
Image from Wikimedia Commons
Unknown (Bain News Service, publisher) - Public Domain
Webster, Jean, 1876-1916
Image from Wikimedia Commons
Bibliothèque et Archives nationales - Beaudry, Québec - Public Domain
Vézina, Joseph 1849-1924
Image from Wikimedia Commons
Civil War Photograph Collection, Library of Congress - Public Domain
Hatch, Edward, 1832-1889
Image from Wikimedia Commons
Bigsby, Robert 1806-1873
Image from Wikimedia Commons
Mathew Brady Levin Corot Handy - Public Domain
Thurman, Allen Granbery, 1813-1895
Image from Wikimedia Commons
Daniel Mietchen - CC0 1.0
David, Paul A.
Image from Wikimedia Commons
W.J. Parry - Public Domain
Parry, W. J. (William John), 1842-1927
Image from Wikimedia Commons
Moshe Milner - Public Domain
Peretti, Achille, 1911-1983
Image from Wikimedia Commons
Boeddeker, Alfred, 1903-
Image from Wikimedia Commons
Haemmerli - CC BY-SA 3.0
Buetti, Daniele.
Image from Wikimedia Commons
Jones, John, 1796-1857
Image from Wikimedia Commons
unknown photographer - Public Domain
DeHaan, M.R. (Martin Ralph), 1891-1965
Image from Wikimedia Commons
William Marshall 1920 - Public Domain
Partridge, Frances, 1900-2004
Image from Wikimedia Commons
Alexander, James W., 1888-1971
Image from Wikimedia Commons
Clairon, Mlle., 1723-1803
Image from Wikimedia Commons
Not stated - Public Domain
Tschermak, Erich, 1871-
Image from Wikimedia Commons
Dudley, Robert, Sir, 1574-1649
Image from Wikimedia Commons
William J. Meuer Photoart Collection - Public Domain
Van Hise, Charles Richard, 1857-1918
Image from Wikimedia Commons
Buber, Martin, 1878-1965
Image from Wikimedia Commons
Senior Airman James C. Dillard; cropped by Blueag9. - Public Domain
Jackson, Bo, 1962-
Image from Wikimedia Commons
Horowitz, Vladimir