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U.S. Army Signal Corps - Public Domain
Reginald Gray - CC BY-SA 3.0
unknown - Public Domain
Jan Šplíchal - CC BY-SA 4.0
Hugh Stuart Campbell (sketched from life) - Public Domain
Gate220 - CC BY-SA 3.0
Sarah Morris -
anonymous - Public Domain
Public Domain
Doc Searls - CC BY-SA 2.0
23artashes - CC BY-SA 3.0
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Bishop, William Avery, 1894-1956
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U.S. Army Signal Corps - Public Domain
Cummings, Emerson L. (Emerson Leroy), 1902-
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Reginald Gray - CC BY-SA 3.0
Bacon, Francis, 1909-1992
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Berners, John Bourchier, Lord, 1466 or 1467-1533
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unknown - Public Domain
Hunt, Richard Morris, 1828-1895
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Jan Šplíchal - CC BY-SA 4.0
Fischl, Viktor, 1912-2006
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Luttrell, Geoffrey, Sir, -1345
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Hugh Stuart Campbell (sketched from life) - Public Domain
Shaw, Mary, 1854-1929
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unknown - Public Domain
Nixon, Samuel Frederick, 1860-1905
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Gate220 - CC BY-SA 3.0
Ortiz, Francis V. (Francis Vincent), 1926-2005
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Hamilton, William Douglas, Duke of, 1635-1694
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Meurent, Victorine
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Parkhurst, John, 1512?-1575
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Mauro, fra, -1459
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Osman Ali, Nizam of Hyderabad, 1886-1967
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Bruce, William Cabell, 1860-1946
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Sarah Morris -
Towne, Robert
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anonymous - Public Domain
Richardson, Leander Pease, 1856-1918
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unknown - Public Domain
Long, Marguerite, 1874-1966
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Public Domain
Del Valle, Reginaldo F. (Reginaldo Francisco), 1854-1938
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Mueller, Ferdinand von 1825-1896
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Doc Searls - CC BY-SA 2.0
Nesson, Charles R.
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Suzuki, Takashi, 1949-....
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Johnston, James Thomas, 1839-1904
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Public Domain
Bennett, Clarence Edmund, 1833-1902
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Rogers, Richard, 1550?-1618
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23artashes - CC BY-SA 3.0
Libaridian, Gerard J.
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Stafford, Granville Leveson-Gower, Marquess of, 1721-1803
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Shooter, Jim
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Sparrman, Anders, 1748-1820