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- Coyne, J. F., R. C. Heller, and J. L. Bean. 1954. Aerial survey methods used in combating a recent epidemic of the southern pine beetle . Association of Southern Agricultual Workers, Proceedings 51:98-99.
- 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, R. C., J. F. Coyne, and J. L. Bean. 1955. Airplanes increase effectiveness of southern pine beetle surveys . Journal of Forestry 53:483-487.