Pettinger, L. F., and D. W. Johnson. 1974. Forest pest conditions in the Pacific Northwest, 1973. United States Department of Agriculture, Forest Service, Pacific Northwest Region, Insect and Disease Control Branch, Division of Timber Management, Portland, Oregon. 15 p.
Pettinger & Johnson 1974
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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