Billings, R. F., and C. Doggett. 1980b. An aerial observer's guide to recognizing and reporting southern pine beetle spots. United States Department of Agriculture, Forest Service, Southeastern Area, State and Private Forestry, Southern Pine Beetle Fact Sheet Number 4, Forestry Bulletin SA-FB/P17. 2 p.
Billings & Doggett 1980
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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