Reference:Soule1993a
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Verbatim text: Soule, J. A. 1993. Systematics of Tagetes (Asteraceae–Tageteae) (Mexico, Argentina). Ph.D. thesis. University of Texas.
Author: Soule, J.A.
Year: 1993
Title: Systematics of Tagetes (Asteraceae–Tageteae) (Mexico, Argentina)