Verbatim text: Duffield, J.W. 1952. Relationships and species hybridization in the genus Pinus. Silvae Genet. 1: 93--97.
Author: Duffield, J.W.
Year: 1952
Title: Relationships and species hybridization in the genus Pinus
Journal: Silvae Genet
Volume: 1
Pages: 93–97