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unknown - Public Domain
unknown photographer - Public Domain
original uploader - Public Domain
Matthew Brady - Public Domain
Juan de Arfe - Public Domain
Oldsoft - Public Domain
Georges Biard - CC BY-SA 3.0
Unknown (Bain News Service, publisher) - Public Domain
USMC - Public Domain
The Wilderness Society -
Eggo123 - CC BY 3.0
Albert Frederick Daniel Studio - CC BY-SA 3.0
author - CC0 1.0
SpaceRocker - Public Domain
Stein - Public Domain
Pavelka01 - CC BY-SA 3.0
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Bellosio, Carlo, 1801-1849.
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Diggle, John W. (John William), 1847-1920
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unknown - Public Domain
Ebbinghaus, Hermann, 1850-1909
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unknown photographer - Public Domain
Salt, Henry S., 1851-1939
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original uploader - Public Domain
Kupffer, Carl von, 1829-1902
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Rosenthal, Moriz
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Matthew Brady - Public Domain
Clay, Cassius Marcellus, 1810-1903
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Juan de Arfe - Public Domain
Arfe y Villafañe, Juan de, 1535-1603
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Zurbarán, Francisco de, 1598-1664
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Oldsoft - Public Domain
Eschenbach, Christoph
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Georges Biard - CC BY-SA 3.0
Rampling, Charlotte, 1946-....
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Unknown (Bain News Service, publisher) - Public Domain
D'Annunzio, Gabriele, 1863-1938
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Funi, Achille, 1890-1972
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USMC - Public Domain
Holcomb, Thomas, 1879-1965
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Manuel, Niklaus, 1484?-1530
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Thomson, Roy Herbert, active 1942-1951, 1st Baron Thomson of Fleet
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The Wilderness Society -
Frank, Bernard, 1902-1964
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Bourmont, Louis-Auguste-Victor de Ghaisne, comte de, 1773-1846
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unknown - Public Domain
Lohenstein, Daniel Casper von 1635-1683
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Féoktistov, Konstantin, 1926-2009
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Eggo123 - CC BY 3.0
Banhart, Devendra
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Albert Frederick Daniel Studio - CC BY-SA 3.0
Johnson, Paul B. (Paul Burney), 1880-1943
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author - CC0 1.0
Mendoza y Ríos, José de, 1763-1816
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unknown - Public Domain
Burns, William J., 1861-1932
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SpaceRocker - Public Domain
Chavez-Thompson, Linda, 1944-
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Banister, John, 1630-1679
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Hamilton, Linda, 1956-
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Stein - Public Domain
Stout, James Huff, 1848-1910
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Holleran, Andrew.
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Pavelka01 - CC BY-SA 3.0
Andújar, Daniel G. (Daniel García), 1966-