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unknown - Public Domain
Harris & Ewing - Public Domain
dovblog - CC BY-SA 2.0
Public Domain
Roferbia - CC BY-SA 3.0
J.E. Purdy - Public Domain
Jacquesverlaeken - CC BY-SA 4.0
Juan de Courbes-Biblioteca Nacional de España - CC BY-SA 4.0
Beat Streuli -
G. van Muysen - Public Domain
Wrathdemon - CC BY-SA 4.0
Deutsche Post der DDR - Public Domain
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unknown - Public Domain
Reighard, Jacob, 1861-1942
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Harris & Ewing - Public Domain
Kean, John, 1852-1914
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Harris, William A. (William Alexander), 1841-1909
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dovblog - CC BY-SA 2.0
Gozansky, Tamar
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unknown - Public Domain
Jones, Robert Emmett, 1912-1997
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Herzog, Herman, 1831-1932
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Castil-Blaze, 1784-1857
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Public Domain
Briggs, James E. (James Elbert), 1906-1979
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Boyd, William, 1885-1979
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Symington, William, 1764-1831
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Robards, Jason
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Roferbia - CC BY-SA 3.0
Allison, Dorothy.
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Khnopff, Fernand, 1858-1921
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unknown - Public Domain
Vining, Elizabeth Gray, 1902-1999
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J.E. Purdy - Public Domain
Carver, Thomas-Nixon 1865-1961
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Jacquesverlaeken - CC BY-SA 4.0
Sprenger, Aloys, 1813-1893
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Hamilton, James, -1803
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Juan de Courbes-Biblioteca Nacional de España - CC BY-SA 4.0
Carvajal y Mendoza, Luisa de 1566-1614
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Maine de Biran, Pierre, 1766-1824
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Beat Streuli -
Streuli, Beat, 1957-....
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Previte, Bobby
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Smoot, Reed, 1862-1941
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G. van Muysen - Public Domain
Burani, Paul, 1845-1901
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Northumberland, Algernon Percy, Earl of, 1602-1668
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Wrathdemon - CC BY-SA 4.0
Ball, Ernest R., 1878-1927
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Deutsche Post der DDR - Public Domain
Joliot-Curie, Frédéric
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Carr, Emily, 1871-1945
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Klein, Bernhard, 1793-1832
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Petrovskiĭ, I. G. (Ivan Georgievich)
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Searcy, Nick