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Michael Bednarek - CC BY-SA 4.0
Greg Hernandez - CC BY 2.0
see here for details: http://digitalgallery.nypl.org/nypldigital/id?1169097 - Public Domain
Photo by Arthur Zinn- "Arthur" - Public Domain
unknown - Public Domain
Oxford and Dilhoff - Public Domain
unknown photographer for :en:Clarkson Potter - Public Domain
Michele Rosi - Public Domain
author - Public Domain
20th Century Fox - CC0 1.0
Sénat français - CC BY-SA 3.0
original uploader -
George Grantham Bain Collection (Library of Congress) - Public Domain
Cathbart1948 - CC BY-SA 4.0
Boaz Vaadia -
Romanceor/credit - CC BY-SA 3.0
Georges Biard - CC BY-SA 3.0
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Michael Bednarek - CC BY-SA 4.0
Queler, Eve
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Greg Hernandez - CC BY 2.0
Sherman, Richard M., 1928-
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see here for details: http://digitalgallery.nypl.org/nypldigital/id?1169097 - Public Domain
Giuliani, Mauro, 1781-1829
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Photo by Arthur Zinn- "Arthur" - Public Domain
Fellows, Don, 1922-2007
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unknown - Public Domain
Lejeune Dirichlet, Peter Gustav, 1805-1859
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unknown - Public Domain
Ronner, Henriëtte 1821-1909
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Oxford and Dilhoff - Public Domain
Marshall, Frank James, 1877-1944
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Porges, Heinrich, 1837-1900
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Testi, Fulvio, conte, 1593-1646
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unknown photographer for :en:Clarkson Potter - Public Domain
Espy, Willard R.
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unknown - Public Domain
Crowther, Samuel, 1806?-1891
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Auger, L.-S. (Louis-Simon), 1772-1829
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Hertling, Georg, Graf von, 1843-1919
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unknown - Public Domain
Scharf, J. Thomas (John Thomas), 1843-1898
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Toreno, Francisco de Borja Queipo de Llano y Gayoso, conde de, 1840-1890
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Michele Rosi - Public Domain
Nina, Lorenzo 1812-1885
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author - Public Domain
Davis, Jefferson Columbus, 1828-1879
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20th Century Fox - CC0 1.0
Woods, Skip.
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Mercy-Argenteau, Florimond-Claude, comte de, 1727-1794
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Sénat français - CC BY-SA 3.0
Pisani, Edgard
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original uploader -
Pilato, Joseph
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George Grantham Bain Collection (Library of Congress) - Public Domain
Flettner, Anton, 1885-1961
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Milton, John, 1807-1865
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Henry, William, 1914-1982
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Cathbart1948 - CC BY-SA 4.0
Noyes, Pierrepont, 1870-
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Lambert, Constant
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Boaz Vaadia -
Vaadia, Boaz, 1951-
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Romanceor/credit - CC BY-SA 3.0
Klein, William
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Georges Biard - CC BY-SA 3.0
Watson, Emma, 1990-....
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Newton, H. A. (Hubert Anson), 1830-1896