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unknown - Public Domain
Thomson Jay Hudson - Public Domain
Alexander Gardner - Public Domain
user at project - CC BY 3.0
Cliff - CC BY 2.0
Raziwanek, Vienna - Public Domain
Marlis Momber - CC BY-SA 3.0
Pier Leone Ghezzi - Public Domain
Greening, Publisher - Public Domain
Not stated - Public Domain
J. B. Rhine - Public Domain
user at project - CC BY-SA 3.0
Arthur Roy - Public Domain
Frank Stone - Public Domain
Gage Skidmore - CC BY-SA 3.0
Mariya Gershteyn - CC BY 3.0
Warburg - Public Domain
Louis Silvestre (photographer) - Public Domain
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unknown - Public Domain
Ripa, Cesare, 1560-1645
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Thomson Jay Hudson - Public Domain
Hodgson, Richard, 1855-1905
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Alexander Gardner - Public Domain
Arnold, Samuel, 1834-1906
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Watson, Thomas E. (Thomas Edward), 1856-1922
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Childress, George Campbell, 1804-1841
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Rodrigues, J. Barbosa (João Barbosa), 1842-1909
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user at project - CC BY 3.0
Sharabi, Shalom, 1720-1777
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Duffy, Hugh, 1866-1954
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Zuccalmaglio, Anton Wilhelm Florentin von 1803-1869
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Cliff - CC BY 2.0
Hughley, D. L. (Darryl L.), 1963-
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Raziwanek, Vienna - Public Domain
Arditi, Luigi, 1822-1903
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Marlis Momber - CC BY-SA 3.0
Harrison, Jan, 1944-....
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Pier Leone Ghezzi - Public Domain
Gaffi, Tommaso Bernardo, 1667-1744
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Greening, Publisher - Public Domain
Reid, Mayne, 1818-1883
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Not stated - Public Domain
Bruce, J. Collingwood (John Collingwood), 1805-1892
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Grädener, Carl 1812-1883
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Jeffords, Tom, 1832-1914
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J. B. Rhine - Public Domain
Pratt, J. Gaither (Joseph Gaither), 1910-1979
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Haan, Jacob Israël de, 1881-1924
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user at project - CC BY-SA 3.0
Clunes, Martin, 1961-
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Arthur Roy - Public Domain
McRae, Alexander Duncan, 1874-1946
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Frank Stone - Public Domain
Stone, Frank, 1800-1859
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Robinson, Miles H.
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Gage Skidmore - CC BY-SA 3.0
Horowitz, David, 1939-....
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Mariya Gershteyn - CC BY 3.0
Korzhavin, N. (Naum), 1925-
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Daniells, Arthur G. (Arthur Grosvenor), 1858-1935
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unknown - Public Domain
Williams, E. S. (Edward Stratten), 1921-
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Warburg - Public Domain
Meier, Richard, 1934-....
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Dykes, John Bacchus, 1823-1876
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Louis Silvestre (photographer) - Public Domain
Ibert, Jacques, 1890-1962