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:de:Giuseppe Antonio Caccioli - Public Domain
unknown - Public Domain
H. Pottin - Public Domain
Mikko Aarnio, mikko.aarnio@iki.fi - CC BY-SA 3.0
Slowking4 -
Eddy Westveer, Permission granted by E-mail - CC BY-SA 2.0
Jpzeller8 - Public Domain
Public Domain
William Berczy, 1811 - Public Domain
Contemporary portrait - Public Domain
NASA/JSC - Public Domain
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:de:Giuseppe Antonio Caccioli - Public Domain
Bibiena, Ferdinando Galli, 1657-1743
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unknown - Public Domain
Tirard, Paul, 1879-1945
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H. Pottin - Public Domain
Érard, Sébastien 1752-1831
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Mikko Aarnio, mikko.aarnio@iki.fi - CC BY-SA 3.0
Haldeman, Joe W.
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Rye, Tom C., 1863-1953
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Bath, William Pulteney, Earl of, 1684-1764
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Reise, Jay
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Salvemini, Gaetano, 1873-1957
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unknown - Public Domain
Zöllner, Johann Karl Friedrich, 1834-1882
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Le Courayer, Pierre-François, 1681-1776
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Slowking4 -
Doctorow, E. L., 1931-2015
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Manning, Irene, 1912-2004
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Hastings, Francis Rawdon-Hastings, Marquess of, 1754-1826
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Eddy Westveer, Permission granted by E-mail - CC BY-SA 2.0
Hargrove, Roy
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Jpzeller8 - Public Domain
Harding, Albert Austin, 1880-1958
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Henrick, Richard P.
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Watteau, Antoine, 1684-1721
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Bell, Alphonzo, 1914-2004
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Public Domain
Ridley, William, 1836-1911
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Cort, John, approximately 1859-1929
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Glauber, Johann Rudolf, 1604-1670
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William Berczy, 1811 - Public Domain
Mackenzie, Roderick, approximately 1761-1844
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Williams, S. Wells (Samuel Wells), 1812-1884
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Contemporary portrait - Public Domain
Robertson, William, 1721-1793
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Belasyse, John Belasyse, Baron, 1615-1689
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Bell, Benjamin, 1749-1806
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unknown - Public Domain
Wittig, Joseph, 1879-1949
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NASA/JSC - Public Domain
Walker, Charles D., 1948-
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Plater, George, 1735-1792
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Nuyen, France, 1939-