- Aldrich, R. C., R. C. Heller, and W. F. Bailey. 1958. Observation limits for aerial sketchmapping southern pine beetle damage in the southern Appalachians . Journal of Forestry 56:200-202.
- Coyne, J. F., and R. C. Heller. 1954. Southern pine beetle survey in northern Alabama. Special Survey Report G-1-54. 4 p. (processed) (probably United States Department of Agriculture, Forest Service, Southern Forest Experiment Station).
- 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, C. 1881. Uber die Verbreitung der Thierwelt im Tiroler Hochgebirge . Akademie der Wissenschaften, Vienna, Mathematische-Naturwissenschaftliche Klasse, Sitzungsberichte 83:103-175.
- Heller, R. C. 1968a. Color aerial transparencies and probability sampling techniques estimate Douglas-fir beetle loss in northwestern California. Pages 22-24 in Nineteenth annual Western Forest Insect Work Conference, Proceedings, 4-7 March 1968, Berkeley, California. United States Department of Agriculture, Forest Service, Region Four, Ogden, Utah. 68 p.
- Heller, R. C. 1968b. Previsual detection of Black Hills beetle infested trees by remote sensing techniques . American Association of Economic Entomology, North Central Branch, Proceedings 23:48.
- Heller, R. C. 1968c. Previsual detection of ponderosa pine trees dying from bark beetle attack. Pages 387-434. Proceedings of the fifth symposium on remote sensing of the environment, University of Michigan, Ann Arbor, 16-18 April 1968.
- Heller, R. C., and R. C. Aldrich. 1955. Observation masks for aerial spotting of insect damaged trees. United States Department of Agriculture, Forest Service. 2 p. (processed).
- Heller, R. C., R. C. Aldrich, and W. F. Bailey. 1959. An evaluation of aerial photography for detecting southern pine beetle (Dendroctonus frontalis) damage . Photogrammetric Engineering 25:595-606.
- Heller, R. C., R. C. Aldrich, W. F. Bailey, and E. P. Merkel. 1955. Status of Ips pine engraver beetle epidemic in southern Georgia, an aerial detection and damage appraisal survey. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest Insect Survey, Report 7 (unpublished).
- Heller, R. C., R. C. Aldrich, W. F. McCambridge, and F. P. Weber. 1967. The use of multispectral sensing techniques to detect ponderosa pine trees under stress from insects or pathogenic organisms. United States Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experimental Station, Annual Progress Report. 65 p.
- 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.
- Heller, R. C., and J. F. Wear. 1969. Sampling forest insect epidemics with color films. International Symposium on Remote Ser. Environ. 6:1157-1167.
- Merkel, E. P., R. C. Heller, R. C. Aldrich, and W. F. Bailey. 1955. Ips pine engraver beetle epidemic in southern Georgia—an aerial detection and damage appraisal survey. United States Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest Insect Survey Report 1. 9 p.