McGregor, M. D., and H. E. Meyer. 1973. Evaluation of mountain pine beetle infestations, Big Belt Mountains, Townsend District, Helena National Forest, 1973. United States Department of Agriculture, Forest Service, Northern Region, Report 73-29. 5 p.
McGregor & Meyer 1973
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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