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Gunn, Charles R, United States, and Agricultural Research Service. "Families and Genera of Spermatophytes Recognized by the Agricultural Research Service." , p.. Print

APA

Gunn, C. R, United States, U. States, & Agricultural Research Service, A. Research Service. (1992). Families and genera of spermatophytes recognized by the Agricultural Research Service.

Chicago

Gunn, Charles R., United States, and Agricultural Research Service. "Families and genera of spermatophytes recognized by the Agricultural Research Service" (1992): p..