Pettinger, L. F., and R. E. Dolph. 1970. Oregon and Washington (R-6). Pages 8-11 in A. E. Landgraf, Forest insect and disease conditions in the United States, 1969. United States Department of Agriculture, Forest Service. vi + 40 p.
Pettinger & Dolph 1970
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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