Reference:Pinkava1964a
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Verbatim text: Pinkava, D. J. 1964. Biosystematic Study of Genus Berlandiera DC. (Compositae). Ph.D. dissertation. Ohio State University.
Author: Pinkava, D.J.
Year: 1964
Title: Biosystematic Study of Genus Berlandiera DC. (Compositae)