Image from Wikimedia Commons
unknown - Public Domain
:Category:W. & D. Downey - Public Domain
NASA - Public Domain
Mathew Brady Levin Corot Handy - Public Domain
Gage Skidmore - CC BY-SA 3.0
Felice Beato - Public Domain
Allan warren - CC BY-SA 3.0
Thomas Sully (1783-1872). - Public Domain
Not stated - Public Domain
Bain - Public Domain
The Department of State, Washington, DC. - Public Domain
US Government Printing Office - Public Domain
M.O. Hammond - Public Domain
''Send to OTRS by Pdeege, picture originates from IMG Artists'' -
user at project - Public Domain
Σ, retouched by Wugapodes - CC BY-SA 4.0
Image from Wikimedia Commons
unknown - Public Domain
Unruh, Hans Victor von 1806-1886
Image from Wikimedia Commons
Stern, Isaac, 1920-2001.
Image from Wikimedia Commons
:Category:W. & D. Downey - Public Domain
Albert Victor, Prince, Duke of Clarence and Avondale, 1864-1892
Image from Wikimedia Commons
Smith, Dick, 1922-
Image from Wikimedia Commons
NASA - Public Domain
Thomas, Andrew (Andrew S. W.), 1951-
Image from Wikimedia Commons
Mathew Brady Levin Corot Handy - Public Domain
Barrow, Middleton Pope, 1839-1903
Image from Wikimedia Commons
Merry del Val, Raphael, 1865-1930
Image from Wikimedia Commons
Gage Skidmore - CC BY-SA 3.0
Bassett, Angela, 1958-
Image from Wikimedia Commons
Branting, Hjalmar, 1860-1925
Image from Wikimedia Commons
Guaraldi, Vince, 1928-1976
Image from Wikimedia Commons
Felice Beato - Public Domain
Alcock, Rutherford, Sir, 1809-1897
Image from Wikimedia Commons
Allan warren - CC BY-SA 3.0
Wyngarde, Peter, 1933-
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Thomas Sully (1783-1872). - Public Domain
Randolph, Peyton, approximately 1778-1828
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Maria Kazimiera, Queen, consort of John III Sobieski, King of Poland, 1641-1716
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Pembroke, George Herbert, Earl of, 1850-1895
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Not stated - Public Domain
De Notaris, Giuseppe, 1805-1877
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Bain - Public Domain
Macy, V. Everit
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Vengerov, S. A.
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G., Warren
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Mundella, Anthony John, 1825-1897
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The Department of State, Washington, DC. - Public Domain
Keïta, Salif, 1949-
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Pronk, J. P. (Johannes Pieter), 1940-
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Leeb, Wilhelm, Ritter von, 1876-1956
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Hunter, David, 1802-1886
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US Government Printing Office - Public Domain
Dow, John G. (John Goodchild), 1905-2003
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M.O. Hammond - Public Domain
Watson, Homer, 1855-1936
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''Send to OTRS by Pdeege, picture originates from IMG Artists'' -
Douglas, Barry, 1960-
Image from Wikimedia Commons
user at project - Public Domain
Mitchison, Naomi, 1897-1999
Image from Wikimedia Commons
Ryan, Meg
Image from Wikimedia Commons
Σ, retouched by Wugapodes - CC BY-SA 4.0
Chomsky, Noam, 1928-