Image from Wikimedia Commons
Tim Pierce - CC BY-SA 3.0
user at project - CC BY-SA 3.0
Mathew Brady - Public Domain
MHM55 - CC BY-SA 3.0
Johann Jakob Balmer - Public Domain
Elinor Remick Warren Society - Public Domain
August Kneisel - Public Domain
Contemporary photograph - Public Domain
unknown - Public Domain
original uploader - Public Domain
Edmunddantes - CC BY-SA 3.0
Sumori - CC BY-SA 3.0
Image from Wikimedia Commons
Tim Pierce - CC BY-SA 3.0
Van Allsburg, Chris
Image from Wikimedia Commons
Gillot, Claude, 1673-1722
Image from Wikimedia Commons
user at project - CC BY-SA 3.0
Desmedt, Yvo
Image from Wikimedia Commons
Mathew Brady - Public Domain
Chanfrau, Henrietta, 1837-1909
Image from Wikimedia Commons
MHM55 - CC BY-SA 3.0
Dolci, Danilo
Image from Wikimedia Commons
Jessop, Gilbert, 1874-1955
Image from Wikimedia Commons
Goodenough, J. G. (James Graham), 1830-1875
Image from Wikimedia Commons
Heine, Gustav, 1812-1866
Image from Wikimedia Commons
Berthet, Élie, 1818-1891
Image from Wikimedia Commons
Planchart, Alejandro Enrique.
Image from Wikimedia Commons
Chevalier, Albert, 1861-1923
Image from Wikimedia Commons
Ralston, William Chapman, 1826-1875
Image from Wikimedia Commons
Isherwood, B. F. (Benjamin Franklin), 1822-1915
Image from Wikimedia Commons
Johann Jakob Balmer - Public Domain
Balmer, Johann Jakob, 1825-1898
Image from Wikimedia Commons
Elinor Remick Warren Society - Public Domain
Warren, Elinor Remick, 1900-1991
Image from Wikimedia Commons
August Kneisel - Public Domain
Gruber, J. G. (Johann Gottfried), 1774-1851
Image from Wikimedia Commons
Contemporary photograph - Public Domain
Thomson, Edward Deas, 1800-1879
Image from Wikimedia Commons
Cobbold, Richard, 1797-1877
Image from Wikimedia Commons
Hogendorp, Gijsbert Karel, Graaf van, 1762-1834
Image from Wikimedia Commons
Crocker, William H. (William Henry)
Image from Wikimedia Commons
Christison, Robert, Sir, 1797-1882
Image from Wikimedia Commons
unknown - Public Domain
Teague, Charles M. (Charles McKevett), 1909-1974
Image from Wikimedia Commons
unknown - Public Domain
Baltard, Victor, 1805-1874
Image from Wikimedia Commons
Bates, Granville, 1882-1940
Image from Wikimedia Commons
Martial
Image from Wikimedia Commons
original uploader - Public Domain
Remarque, Erich Maria, 1898-1970
Image from Wikimedia Commons
Edmunddantes - CC BY-SA 3.0
Jones, Jim, 1931-1978
Image from Wikimedia Commons
Smith, William Sooy, 1830-1916
Image from Wikimedia Commons
Carmody, Don.
Image from Wikimedia Commons
Sumori - CC BY-SA 3.0
Newman, Randy