Image from Wikimedia Commons
Luigi Morante - CC BY 2.0
''unknown'' - Public Domain
Photographer not named. PD-Norway50 - Public Domain
Unknown Military Photographer of Signal Corps - Public Domain
Pach Bros. - Public Domain
unknown photographer - Public Domain
Smithsonian Institution Archives - Public Domain
Alex Cao - CC BY-SA 3.0
unknown - Public Domain
John Riley - Public Domain
Smokefoot - CC BY-SA 3.0
unknown -
Peter Clarke - CC BY-SA 3.0
James Bogle - Public Domain
Solomon Farnham Kimball - Public Domain
JFT257 - CC BY-SA 3.0
Bain - Public Domain
Unattributed - Public Domain
Image from Wikimedia Commons
Luigi Morante - CC BY 2.0
Parra, Isabel
Image from Wikimedia Commons
''unknown'' - Public Domain
Harty, Hamilton, 1879-1941
Image from Wikimedia Commons
Photographer not named. PD-Norway50 - Public Domain
Sverdrup, H.U. (Harald Ulrik), 1888-1957
Image from Wikimedia Commons
Unknown Military Photographer of Signal Corps - Public Domain
Tweed, George R.
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Pach Bros. - Public Domain
Gates, Frederick Taylor, 1853-1929
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unknown photographer - Public Domain
Sinzheimer, Hugo, 1875-1945
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Travis, Randy
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Archenhold, F. S. (Friedrich Simon)
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Smithsonian Institution Archives - Public Domain
Morgan, Ann Haven, 1882-1966
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Marchesi, Blanche, 1863-1940
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Howard of Effingham, William Howard, Baron, approximately 1510-1573
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Poincare, Henriette
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Alex Cao - CC BY-SA 3.0
Couture, Lise Anne, 1959-....
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unknown - Public Domain
Reese, Terence.
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John Riley - Public Domain
Jeffreys, George Jeffreys, Baron, 1644 or 1645-1689
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Smokefoot - CC BY-SA 3.0
Wilkinson, Geoffrey, 1921-1996
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unknown -
Prudden, Bonnie, 1914-2011
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Montrose, James Graham, Marquis of, 1612-1650
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Young, Charles A. (Charles Augustus), 1834-1908
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Peter Clarke - CC BY-SA 3.0
Clarke, Bob, 1926-2013
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James Bogle - Public Domain
Harris, Townsend, 1804-1878
Image from Wikimedia Commons
Solomon Farnham Kimball - Public Domain
Whitney, Helen Mar, 1828-1896
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Gibbons, Floyd Phillips, 1887-1939
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Bitter, Karl Theodore Francis, 1867-1915
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JFT257 - CC BY-SA 3.0
Tremblay, Gilles
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Foley, John Henry, 1818-1874
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Chase, Owen
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Bain - Public Domain
Livingston, Rose E., 1885-1948
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Unattributed - Public Domain
Viñes, Ricardo 1875-1943
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Das, Sarat Chandra, 1849-1917