Heller, R. C., J. L. Bean, and F. B. Knight. 1959. Aerial surveys of Black Hills beetle infestations. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Paper 46. 8 p.
Heller et al. 1959
Funded by the National Science Foundation PEET program (Partnerships for Enhancing Expertise in Taxonomy)
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