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Cactus And Succulent Society Of America - CC BY-SA 2.5
Wikipedia:Lothar Wolleh -
Ellis - Public Domain
Self-portrait - Public Domain
unknown - Public Domain
Editors: Christie Williams and LeeAnn Roberts - Public Domain
Tiffany Productions - Public Domain
Some XVI-century Italian mint - Public Domain
Public Domain
George Collins Cox - Public Domain
Doane Family - Public Domain
Eugeen Van Mieghem -
anonymous - CC BY-SA 3.0
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Cactus And Succulent Society Of America - CC BY-SA 2.5
Pittier, Henri, 1857-1950
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Thießen, Peter Adolf, 1899-
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Wikipedia:Lothar Wolleh -
Arman, 1928-2005
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Ellis - Public Domain
Lorimer, George Horace, 1868-1937
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Self-portrait - Public Domain
Harris, John, 1916-1991
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Forster, T. (Thomas), 1789-1860
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unknown - Public Domain
Movius, Hallam L. (Hallam Leonard), 1907-1987
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Smith, J. Lawrence (John Lawrence), 1818-1883
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Pennant, Thomas, 1726-1798
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Bailey, Clayton, 1939-
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Ohtake, Tomie
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Editors: Christie Williams and LeeAnn Roberts - Public Domain
Packer, Boyd K.
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Condo, George
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Tiffany Productions - Public Domain
Santschi, Tom, 1879-1931
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Some XVI-century Italian mint - Public Domain
Sforza, Giovanni, 1466-1510
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unknown - Public Domain
Quintilian
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Public Domain
Parker, Daniel, 1781-
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George Collins Cox - Public Domain
Lounsbury, Thomas R., 1838-1915
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unknown - Public Domain
Trochu, Louis-Jules, 1815-1896
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Tchernowitz-Avidar, Yemimah, 1909-1998
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Doane Family - Public Domain
Doane, Pelagie, 1906-
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Public Domain
Parry, John Orlando, 1810-1879
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Public Domain
Richardson, Henry Handel, 1870-1946
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Woodrum, Clifton A. (Clifton Alexander), 1887-1950
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McCormack, Eric, 1963-
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Eugeen Van Mieghem -
Mieghem, Eugeen van, 1875-1930
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Deal, Joseph T. (Joseph Thomas), 1860-1942
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unknown - Public Domain
Weiner, Richard, 1884-1937
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anonymous - CC BY-SA 3.0
Tournemire, Charles, 1870-1939
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Kodama, Yoshio, 1911-1984