Gregg, T. F., D. J. Goheen, and D. R. Bridgwater. 1978. Pacific Northwest Region (R-6). Pages 39-48 in P. W. Orr and H. D. Brown, Forest insect and disease conditions in the United States, 1977. United States Department of Agriculture, Forest Service. 88 p.
Gregg et al. 1978
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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