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Alvintrusty - CC BY-SA 3.0
NASA - Public Domain
Paul Cézanne - Public Domain
IBL - Public Domain
Photograph attributed to the Sims and Ronsham studio - Public Domain
Philkon - Public Domain
Harris & Ewing, photographer - Public Domain
PD-USGov - Public Domain
unknown - Public Domain
Public Domain
Antonio de La Gandara - Public Domain
Slowking4 -
Joseph Slater - Public Domain
Hillebrant Jacobsz. van Wouw I - Public Domain
Looneydelight - CC BY-SA 4.0
Gage Skidmore - CC BY-SA 3.0
Nicholas Hilliard - Public Domain
Hammer & Co. - Public Domain
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Turner, J. M. W. (Joseph Mallord William), 1775-1851
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Alvintrusty - CC BY-SA 3.0
Kellogg, Steven
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NASA - Public Domain
Chang-Díaz, Franklin R., 1950-
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Delafield, Francis, 1841-1915
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Oistrakh, Igor, 1931-
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Paul Cézanne - Public Domain
Gasquet, Joachim, 1873-1921
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DeCamp, Joseph, 1858-1923
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IBL - Public Domain
Bergman, Hjalmar, 1883-1931
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Photograph attributed to the Sims and Ronsham studio - Public Domain
Leno, Dan, 1860-1904
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Feuerbach, Anselm Friedrich, 1829-1880
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Philkon - Public Domain
Oates, John
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Harris & Ewing, photographer - Public Domain
McKinley, William Brown, 1856-1926
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PD-USGov - Public Domain
Withrow, Mary Ellen, 1930-
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Mortimer, Emily
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unknown - Public Domain
Lévy, Heniot, 1879-1945
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Public Domain
Angell, James Burrill, 1829-1916
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Antonio de La Gandara - Public Domain
La Gandara, Antonio de, 1861-1917
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Csontváry Kosztka, Tivadar, 1853-1919
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France, Anatole, 1844-1924
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unknown - Public Domain
Cook, Merrill, 1946-
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Slowking4 -
Grady, James, 1949-
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Ledwidge, Francis, 1887-1917
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Joseph Slater - Public Domain
Smyth, William, 1765-1849
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unknown - Public Domain
Maffei, Andrea, 1798-1885
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Doty, James Duane, 1799-1865
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Hillebrant Jacobsz. van Wouw I - Public Domain
Verdugo, Francisco
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Looneydelight - CC BY-SA 4.0
Pratt, Greta
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Gage Skidmore - CC BY-SA 3.0
Wolf, Scott, 1968-....
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Nicholas Hilliard - Public Domain
Hunsdon, George Carey, Baron, 1547-1603
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Hammer & Co. - Public Domain
Lewis, Essington, 1881-1961