Washburn, R. I., and J. A. E. Knopf. 1958. Engelmann spruce beetle conditions in the spruce stands of Forest Service Region 4. United States Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, Ogden, Utah, Report 10.
Washburn & Knopf 1958
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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