McGregor, M. D., W. E. Bousfield, and D. Almas. 1972. Evaluation of the Douglas-fir beetle infestation in the North Fork Clearwater River drainage, Idaho, 1972. United States Department of Agriculture, Forest Service, Northern Region, Insect and Disease Report 1-72-10. 9 p.
McGregor et al. 1972
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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