Image from Wikimedia Commons
US Government Printing Office - Public Domain
Edward Quinton Keasbey (1849-1925) - Public Domain
No photo credit given. It is from: - Public Domain
Sebastian Furck - Public Domain
unknown - Public Domain
Unknown military photographer of the Signal Corps - Public Domain
Frim99954p - CC BY-SA 3.0
Not known - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Imoisset - CC BY-SA 4.0
Rubenstein - CC BY 2.0
Peregrip - CC BY-SA 3.0
Photographer-Ernest Bachrach - Public Domain
Image from Wikimedia Commons
Kelly, Clyde, 1883-1935
Image from Wikimedia Commons
US Government Printing Office - Public Domain
Harris, Oren, 1903-1997
Image from Wikimedia Commons
Edward Quinton Keasbey (1849-1925) - Public Domain
Case, Clarence E. (Clarence Edwards), 1877-1961
Image from Wikimedia Commons
Kunits, Luigi von, 1870-1931
Image from Wikimedia Commons
Marten, Henry, 1602-1680
Image from Wikimedia Commons
Mould, J. Wrey (Jacob Wrey), 1825-1886
Image from Wikimedia Commons
No photo credit given. It is from: - Public Domain
Jacobs, Henry Eyster, 1844-1932
Image from Wikimedia Commons
Sebastian Furck - Public Domain
herbst, Johann Andreas, 1588-1666
Image from Wikimedia Commons
Linton, Martin
Image from Wikimedia Commons
unknown - Public Domain
Landauer, Gustav, 1870-1919
Image from Wikimedia Commons
Lehmann, Henri, 1814-1882
Image from Wikimedia Commons
Renne, Roland Roger, 1905-
Image from Wikimedia Commons
Marttinen, Tauno
Image from Wikimedia Commons
Pils, Isidore, 1813-1875
Image from Wikimedia Commons
Dadant, Charles, 1817-1902
Image from Wikimedia Commons
Fields, Arthur
Image from Wikimedia Commons
Unknown military photographer of the Signal Corps - Public Domain
Marshall, S.L.A. (Samuel Lyman Atwood), 1900-1977
Image from Wikimedia Commons
Frim99954p - CC BY-SA 3.0
Botstein, Leon
Image from Wikimedia Commons
Talbot, John, Earl of Shrewsbury, 1383-1453
Image from Wikimedia Commons
Not known - Public Domain
Archer, Colin, 1832-1921
Image from Wikimedia Commons
Donzelli, Domenico, 1790-1873
Image from Wikimedia Commons
Mathew Brady Levin Corot Handy - Public Domain
Morton, Oliver P. (Oliver Perry), 1823-1877
Image from Wikimedia Commons
unknown - Public Domain
Iddings, Joseph Paxson, 1857-1920
Image from Wikimedia Commons
Peacock, Thomas Love, 1785-1866
Image from Wikimedia Commons
Fenton, George
Image from Wikimedia Commons
Imoisset - CC BY-SA 4.0
Scott Brown, Denise, 1931-....
Image from Wikimedia Commons
Plunkett, George Noble Plunkett, Count, 1851-1948
Image from Wikimedia Commons
Rubenstein - CC BY 2.0
Posen, Zac
Image from Wikimedia Commons
Peregrip - CC BY-SA 3.0
Ember, Melvin
Image from Wikimedia Commons
Photographer-Ernest Bachrach - Public Domain
Andrews, Stanley, 1891-1969