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unknown - Public Domain
Aartevo - CC BY-SA 3.0
Günter Prust - CC BY 3.0
https://www.flickr.com/photos/vagueonthehow/ - CC BY 2.0
Unknown - Public Domain
Walter Case Anthony (1842-1930) - Public Domain
Portrait of John Clarkson, painter unknown. - Public Domain
MichaelNetzer - CC BY-SA 3.0
Richard Strauss -
State of Tennessee - Public Domain
U.S. Army Signal Corps (1917) - Public Domain
Photographer not indicated in source -
user at project -
GFDL-user-w - CC BY-SA 3.0
Konrad Jacobs - CC BY-SA 2.0
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unknown - Public Domain
Sullivan, Timothy Daniel, 1862-1913
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Aartevo - CC BY-SA 3.0
Lestié, Alain, 1944-....
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McBride, James, 1788-1859
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Paskevich, Ivan Fedorovich, svetleĭshiĭ kni︠a︡zʹ Varshavskiĭ, 1782-1856
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Günter Prust - CC BY 3.0
Aldridge, James, 1918-
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https://www.flickr.com/photos/vagueonthehow/ - CC BY 2.0
Hartley, Justin, 1977-
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Smith, Theobald, 1859-1934
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Pacioli, Luca, approximately 1445-1517
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Colman, George, 1762-1836 ,
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Unknown - Public Domain
Bayes, Thomas, -1761
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unknown - Public Domain
Bullock, Seth, 1849-1919
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Jacobi, Johann Georg, 1740-1814
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Tullin, Chr. B. (Chr. Braunmann)
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Boorstin, Daniel J., 1956
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Walter Case Anthony (1842-1930) - Public Domain
Fisk, Jonathan, 1778-1832
Image from Wikimedia Commons
Portrait of John Clarkson, painter unknown. - Public Domain
Clarkson, John, 1764-1828
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MichaelNetzer - CC BY-SA 3.0
Spurgeon, Tom, 1968-
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Lucas, William, 1800-1877
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Richard Strauss -
Heyman, Ira Michael, 1930-2011
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State of Tennessee - Public Domain
McAlister, Hill, 1875-1959
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James, William, 1542-1617
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U.S. Army Signal Corps (1917) - Public Domain
McIver, George Willcox, 1858-1947
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Photographer not indicated in source -
Leopold, Alice Koller, 1906-1982
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Thomsen, Vilhelm, 1842-1927
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user at project -
Kennett, Jeff, 1948-
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GFDL-user-w - CC BY-SA 3.0
Adams, Patch, 1945-....
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unknown - Public Domain
Gatty, Alfred, Mrs., 1809-1873
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Konrad Jacobs - CC BY-SA 2.0
Rota, Gian-Carlo, 1932-1999
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Gheorghiu, Angela
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Hasford, Gustav