Pierce, D. A. 1961. Classes of ponderosa pine in New Mexico and Arizona susceptible to attack by the southwestern pine beetle (Dendroctonus harberi) and associated bark beetles. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Station Paper 64. 9 p.
Pierce 1961
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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