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Marcel Antonisse / Anefo - CC BY-SA 3.0
Public Domain
unknown - Public Domain
Joi - CC BY-SA 3.0
US Government Printing Office (Washington, DC), publisher. - Public Domain
Lithography by unknown artist - Public Domain
Grifols - CC BY-SA 4.0
Charles Théophile Angrand - Public Domain
GBarreca - Public Domain
Alfred Aho - Public Domain
Unknown - Public Domain
anonymous - Public Domain
August Prinzhofer - Public Domain
Andreseduardop - CC BY-SA 4.0
Vogler - CC BY-SA 3.0
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Rammelsberg, C. F., 1813-1899
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Marcel Antonisse / Anefo - CC BY-SA 3.0
Shamir, Itzhak, 1915-2012
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Public Domain
Fedorova, Sofʹi︠a︡ Vasilʹevna, 1879-1963
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Haynes, Elwood, 1857-1925
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Toledo, Isabel, 1961-....
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unknown - Public Domain
Urner, Catherine, 1891-1942
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Overman, Lee S. (Lee Slater), 1854-1930
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Joi - CC BY-SA 3.0
Machover, Tod
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Pellegrini, Carlo, 1838-1889
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US Government Printing Office (Washington, DC), publisher. - Public Domain
Marcantonio, Vito, 1902-1954
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Lithography by unknown artist - Public Domain
Rinman, Sven, 1720-1792
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Kaspi, Mati
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Maugham, Robin, 1916-1981
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unknown - Public Domain
Tilton, William Stowell, 1828-1889
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Grifols - CC BY-SA 4.0
Cohn, Edwin J. (Edwin Joseph), 1892-1953
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Inglis, Elsie Maud, 1864-1917
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unknown - Public Domain
Lewis, Mitchell, 1880-1956
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unknown - Public Domain
Stickley, Gustav, 1858-1942
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Charles Théophile Angrand - Public Domain
Angrand, Charles, 1854-1926
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Morgan, John Hunt, 1825-1864
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Canfield, Harry C. (Harry Clifford), 1875-1945
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GBarreca - Public Domain
Barreca, Regina.
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Alfred Aho - Public Domain
Aho, Alfred V.
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Unknown - Public Domain
Fürstner, Carl, 1848-1906
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anonymous - Public Domain
Plaatje, Sol. T. (Solomon Tshekisho), 1876-1932
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Conklin, William, -1935
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August Prinzhofer - Public Domain
Fenzl, Eduard, 1808-1879
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Andreseduardop - CC BY-SA 4.0
Rayo, Omar, 1928-2010
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Coolidge, Calvin, Jr., 1908-1924
Image from Wikimedia Commons
Vogler - CC BY-SA 3.0
Heeger, Alan J., 1936-