Reference:Spence1963a
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Verbatim text: Spence, W. L. 1963. A Biosystematic Study of the Genus Lessingia Cham. (Compositae). Ph.D. thesis. University of California, Berkeley.
Author: Spence, W.L.
Year: 1963
Title: A Biosystematic Study of the Genus Lessingia Cham. (Compositae)