Knight, F. B., W. F. McCam-Bridge, and B. H. Wilford. 1956. Estimating Engelmann spruce beetle infestation in the central Rocky Mountains. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Paper 25. 12 p.
Knight et al. 1956
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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