Cahill, D. B., C. K. Lister, and D. H. Brown. 1973. Central Rocky Mountains (R-2). Pages 32-40 in D. P. Graham and J. F. Chansler. Forest insect and disease conditions in the United States, 1972. United States Department of Agriculture, Forest Service. vi + 72 p.
Cahill et al. 1973
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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