Bousfield, W. E., and C. E. Carlson. 1978. Northern Region (R-1). Pages 3-6 in H. D. Brown and P. W. Orr, Forest insect and disease conditions in the United States 1976. United States Department of Agriculture, Forest Service. vi + 40 p.
Bousfield & Carlson 1978
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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