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Anton Retel Helmrich - CC BY 3.0
Filippo Rossini - CC BY-SA 3.0
George Grantham Bain Collection (Library of Congress) - Public Domain
Hildegard Weber - CC BY-SA 3.0
unknown - Public Domain
DanteParadiso - CC BY-SA 4.0
André Adolphe Eugène Disderi, photographer. Upload, stitch and restoration by Jebulon - Public Domain
Fisher, I.F. and Fisk, E.L. - Public Domain
Joel Seidenstein (1944-2008) - CC BY-SA 3.0
Alan Light - CC BY 2.0
Tzetzes - CC BY-SA 4.0
Erling mandelmann - CC BY-SA 3.0
Roger McGuinn - Public Domain
the collection of the Department of Soil Science, University of Wisconsin-Madison - Public Domain
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Anton Retel Helmrich - CC BY 3.0
Retel Helmrich, Leonard
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Isherwood, B. F. (Benjamin Franklin), 1822-1915
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Willaumez, Jean-Baptiste-Philibert, comte, 1761-1845
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Belmont, August, 1853-1924
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Filippo Rossini - CC BY-SA 3.0
Rossini, Luigi, 1790-1857
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Williams, Whiting, 1878-1975
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George Grantham Bain Collection (Library of Congress) - Public Domain
Lovejoy, Esther Pohl, 1870-1967
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Hildegard Weber - CC BY-SA 3.0
Cahn, Marcelle
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Pils, Isidore, 1813-1875
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unknown - Public Domain
Phelps, Austin, 1820-1890
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Normanby, Constantine Henry Phipps, Marquess of, 1797-1863
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unknown - Public Domain
Burroughs, William Seward, 1858?-1898
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Keating, Thomas
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I︠U︡ng, Klara, 1883-1952
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DanteParadiso - CC BY-SA 4.0
Centolella, Thomas
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Haas, Pavel
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Hudson, George, 1800-1871
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André Adolphe Eugène Disderi, photographer. Upload, stitch and restoration by Jebulon - Public Domain
Falloux du Coudray, Alfred-Frédéric-Pierre, comte de, 1811-1886
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Fisher, I.F. and Fisk, E.L. - Public Domain
Winslow, C.-E. A. (Charles-Edward Amory), 1877-1957
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unknown - Public Domain
Halpine, Charles G. (Charles Graham), 1829-1868
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Gresset, 1709-1777
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Kiki, 1901-1953
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Joel Seidenstein (1944-2008) - CC BY-SA 3.0
Kunstler, William M. (William Moses), 1919-1995
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Leśniewski, Stanisław, 1886-1939
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unknown - Public Domain
Reeder, Andrew H. (Andrew Horatio), 1807-1864
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Alan Light - CC BY 2.0
Principal, Victoria
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Tzetzes - CC BY-SA 4.0
Haldeman-Julius, Marcet, 1887-1941
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Erling mandelmann - CC BY-SA 3.0
Burri, René
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Roger McGuinn - Public Domain
McGuinn, Roger
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the collection of the Department of Soil Science, University of Wisconsin-Madison - Public Domain
Truog, Emil, 1884-....