Knopf, J. A. E., W. H. Klein, and A. C. Tegethoff. 1977. Intermountain States (R-4). Pages 18-21 in H. V. Toko and T. J. Rogers, Forest insect and disease conditions in the United States, 1974. United States Department of Agriculture, Forest Service. vi + 55 p.
Knopf et al. 1977
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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