Pettinger, L. F., and D. W. Johnson. 1973b. Oregon and Washington (R-6). Pages 8-14 in D. P. Graham and J. F. Chansler, Forest insect and disease conditions in the United States, 1972. United States Department of Agriculture, Forest Service. vi + 72 p.
Pettinger & Johnson 1973
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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