Image from Wikimedia Commons
Roms69 - CC BY-SA 3.0
CBS Television - Public Domain
original uploader - Public Domain
unknown - Public Domain
Alan Light - CC BY 2.0
john safer - CC BY-SA 3.0
Gouvyrisotto - CC BY-SA 4.0
Mathew Brady (1822-1896) or Levin Handy (1855-1932) - Public Domain
Frank Schneider (1881-1935), based on a (now lost?) painting by George Catlin. - Public Domain
Kolvoce - CC BY-SA 3.0
*:File:DF-SC-83-02204.jpg - Public Domain
Unknown. This print was taken from the ''Los Angeles Times.''<br/> - Public Domain
Ajderrick - CC BY-SA 4.0
Fortheloveofknowledge - CC BY-SA 4.0
Image from Wikimedia Commons
Roms69 - CC BY-SA 3.0
Johnson, Adam, 1967-....
Image from Wikimedia Commons
CBS Television - Public Domain
Scott, Pippa, 1935-
Image from Wikimedia Commons
Arrhenius, Svante, 1859-1927
Image from Wikimedia Commons
Ridge, John Rollin, 1827-1867.
Image from Wikimedia Commons
original uploader - Public Domain
Hughes, William, 1872-1916
Image from Wikimedia Commons
unknown - Public Domain
Harris, C. Alexander (Charles Alexander), Sir, 1855-1947
Image from Wikimedia Commons
Alan Light - CC BY 2.0
Nielsen, Leslie, 1926-2010
Image from Wikimedia Commons
Geoffrin, Marie-Thérèse Rodet, 1699-1777
Image from Wikimedia Commons
john safer - CC BY-SA 3.0
Safer, John
Image from Wikimedia Commons
Gouvyrisotto - CC BY-SA 4.0
Naoumoff, Émile 1962-....
Image from Wikimedia Commons
Mathew Brady (1822-1896) or Levin Handy (1855-1932) - Public Domain
Gresham, Walter Quintin, 1832-1895
Image from Wikimedia Commons
Frank Schneider (1881-1935), based on a (now lost?) painting by George Catlin. - Public Domain
Laveau, Marie, 1801-1881
Image from Wikimedia Commons
Zhou, Yang, 1908-1989
Image from Wikimedia Commons
Rice, William S. (William Seltzer), 1873-1963
Image from Wikimedia Commons
unknown - Public Domain
Rotrou, Jean, 1609-1650
Image from Wikimedia Commons
Kolvoce - CC BY-SA 3.0
Naumbourg, Samuel, 1817-1880
Image from Wikimedia Commons
Milman, Henry Hart, 1791-1868
Image from Wikimedia Commons
Bunin, Ivan Alekseevich, 1870-1953
Image from Wikimedia Commons
Martini, Simone, 1283-1344
Image from Wikimedia Commons
Straczynski, J. Michael, 1954-....
Image from Wikimedia Commons
Powell, Leven, 1737-1810
Image from Wikimedia Commons
*:File:DF-SC-83-02204.jpg - Public Domain
Habyarimana, Juvénal
Image from Wikimedia Commons
Unknown. This print was taken from the ''Los Angeles Times.''<br/> - Public Domain
Conaty, Thomas James, 1847-1915
Image from Wikimedia Commons
unknown - Public Domain
Metcalf, Keyes DeWitt, 1889-1983
Image from Wikimedia Commons
Scliar, Moacyr
Image from Wikimedia Commons
Ajderrick - CC BY-SA 4.0
Durkan, Jenny, 1958-
Image from Wikimedia Commons
Fortheloveofknowledge - CC BY-SA 4.0
Fleming, Ian, 1908-1964
Image from Wikimedia Commons
unknown - Public Domain
Allen, Henry Watkins, 1820-1866
Image from Wikimedia Commons
White, James, 1821-1881
Image from Wikimedia Commons
Yergin, Daniel.