Image from Wikimedia Commons
flickrStrelka - CC BY 2.0
Bain News Service, publisher - Public Domain
unknown - Public Domain
Alan Light - CC BY 2.0
Billiel12 - CC BY-SA 3.0
Charles Deforest Fredricks - Public Domain
James Abbe (picture credit) - Public Domain
anonymous - Public Domain
Hiram Carleton, ed. - Public Domain
Warner Bros. - Public Domain
Jmontbarron - CC BY-SA 4.0
Mathew Brady - Public Domain
Image from Wikimedia Commons
flickrStrelka - CC BY 2.0
Kuma, Kengo, 1954-....
Image from Wikimedia Commons
Myers, Richard B., 1942-....
Image from Wikimedia Commons
Bain News Service, publisher - Public Domain
Luce, Claire 1903-1989
Image from Wikimedia Commons
Andrus, Milo, 1814-1893
Image from Wikimedia Commons
unknown - Public Domain
Walpole, Henry, 1558-1595
Image from Wikimedia Commons
Alan Light - CC BY 2.0
Gordon, Gale, 1906-1995
Image from Wikimedia Commons
Billiel12 - CC BY-SA 3.0
Lawless, Billie, 1950-
Image from Wikimedia Commons
D'Albertis, Luigi Maria, 1841-1901
Image from Wikimedia Commons
Martin, John, 1789-1854
Image from Wikimedia Commons
Stoughton, William Lewis, 1827-1888
Image from Wikimedia Commons
Chambers, Thomas, Sir, 1814-1891
Image from Wikimedia Commons
Charles Deforest Fredricks - Public Domain
Dilger, Hubert Anton Casimir, 1836-1911
Image from Wikimedia Commons
Klausner, Joseph, 1874-1958
Image from Wikimedia Commons
Hyde, William De Witt, 1858-1917
Image from Wikimedia Commons
Woodring, Harry Hines, 1887-1967
Image from Wikimedia Commons
Tyson, Edward, 1650-1708
Image from Wikimedia Commons
Young, Gary, 1951-
Image from Wikimedia Commons
James Abbe (picture credit) - Public Domain
Acker, Jean, 1893-1978
Image from Wikimedia Commons
Switzer, Carl, 1927-1959
Image from Wikimedia Commons
Noel-Baker, Philip, 1889-1982
Image from Wikimedia Commons
unknown - Public Domain
Ciołkosz, Adam
Image from Wikimedia Commons
Rose, Leonard
Image from Wikimedia Commons
Hilton, Nicholai Olivia, 1983-
Image from Wikimedia Commons
anonymous - Public Domain
Jessup, William, 1797-1868
Image from Wikimedia Commons
White, Edwin D., 1817-1877
Image from Wikimedia Commons
Hiram Carleton, ed. - Public Domain
Wheeler, Hoyt Henry, 1833-1906
Image from Wikimedia Commons
Warner Bros. - Public Domain
Hovey, Ann, 1911-2007
Image from Wikimedia Commons
Jmontbarron - CC BY-SA 4.0
Barron, Jeannette Montgomery, 1956-
Image from Wikimedia Commons
Mathew Brady - Public Domain
Davis, Joseph Jonathan, 1828-1892
Image from Wikimedia Commons
unknown - Public Domain
Rossi, Ernesto, 1827-1896