Johnson, D. W., and C. G. O'Neil. 1986. Forest pest conditions in the Rocky Mountain Region for 1985. United States Department of Agriculture, Forest Service, Timber, Forest Pest, and Cooperative Forestry Management (Denver, Colorado). 48 p.
O'Neil & Johnson 1986
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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