McGregor, M. D., R. E. Williams, C. E. Carlson, O. J. Dooling, and D. P. Hamel. 1977. Northern Rocky Mountains (R-1). Pages 21-28 in H. V. Toko and T. J. Rogers (eds.), Forest insect and disease conditions in the United States, 1974. United States Department of Agriculture, Forest Service. vi + 55 p.
McGregor et al. 1977
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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