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Gregg et al. 1980

Gregg, T. F., G. M. Filip, and J. S. Hadfield. 1980. Pacific Northwest Region (R-6). Pages 37-42 in P. W. Orr and H. D. Brown, Forest insect and disease conditions in the United States, 1978. United States Department of Agriculture, Forest Service. vi + 83 p.
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