Ketcham, D. E. 1964a. Aerial survey plan for sampling barkbeetle populations . United States Department of Agriculture, Forest Service, Branch of Forest Insect and Disease Control, Division of State and Private Forestry, Atlanta, Georgia, Work Conference Proceedings 3:82-101.
Ketcham 1964
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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