Twardus, D. B., G. D. Hertel, and G. W. Ryan. 1978. Southern pine beetle infestation, growth, and decline, 1977. United States Department of Agriculture, Forest Service, Southern Region, Forest Pest Management, Report 78-2-8.
Twardus et al. 1978
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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