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Edward Scriven - Public Domain
anonymous - Public Domain
unknown -
:en:Henry Jamison Handy -
unknown - Public Domain
Krayfish - CC BY-SA 3.0
anonymous -
the collection of the Department of Soil Science, University of Wisconsin-Madison - Public Domain
Bain News Service, publisher. - Public Domain
Halsey, Francis Whiting - Public Domain
Artist : Willy Bosschem; photo by Georges Jansoone (JoJan - CC BY-SA 3.0
Stevan Kragujević - CC BY-SA 3.0
Warburg - CC BY-SA 3.0
Photographer unknown, included by Robert Logan Jack (subject of photo) in his book without attribution - Public Domain
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André, Johann, 1741-1799
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Boggs, Charles Stuart, 1811-1888
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Edward Scriven - Public Domain
Worcester, Edward Somerset, Marquis of, 1601-1667
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Clinton, Henry, 1771-1829
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Wiedemann, Gustav Heinrich, 1826-1899
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Rodchenko, Aleksandr Mikhaĭlovich, 1891-1956
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Brown, Jerry, 1938-....
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anonymous - Public Domain
Caffin, Charles H. (Charles Henry), 1854-1918
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Verster, Floris, 1861-1927
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unknown -
Kluyver, A.J. (Albert Jan), 1888-1956
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:en:Henry Jamison Handy -
Lopez, Al, 1908-
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unknown - Public Domain
Vieu, Jane
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Krayfish - CC BY-SA 3.0
Raffo, Heather, 1970-
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anonymous -
Sistermans, Anton, 1865-1926
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unknown - Public Domain
Stribling, T. S. (Thomas Sigismund), 1881-1965
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the collection of the Department of Soil Science, University of Wisconsin-Madison - Public Domain
Truog, Emil, 1884-....
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Bain News Service, publisher. - Public Domain
Van Devanter, Willis, 1859-1941
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Pius IX, Pope, 1792-1878
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Montesquiou-Fézensac, Robert, comte de, 1855-1921
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Halsey, Francis Whiting - Public Domain
Seeger, Alan, 1888-1916
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unknown - Public Domain
Germain, Sophie, 1776-1831
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Jernigan, Tamara Elizabeth, 1959-
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Dujardin, Karel, 1622?-1678
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unknown - Public Domain
Fitzgerald, Edward Mary, 1833-1907
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Powderly, Terence Vincent, 1849-1924
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unknown - Public Domain
Davis, Jackson Lee, 1870?-1949
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Artist : Willy Bosschem; photo by Georges Jansoone (JoJan - CC BY-SA 3.0
Hoeydonck, Paul van, 1925-
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Stevan Kragujević - CC BY-SA 3.0
Djilas, Milovan, 1911-1995
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Warburg - CC BY-SA 3.0
Vignola, 1507-1573
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Photographer unknown, included by Robert Logan Jack (subject of photo) in his book without attribution - Public Domain
Jack, Robert Logan, 1845-1921