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- 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Department of Agriculture, Forest Service, Southeastern Forest Experiment Station, Forest Insect Survey, Report 7 (unpublished).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.
- 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.
- Aldrich, R. 1976. Evaluation of Skylab (EREP) data for forest and rangeland surveys. United States Department of Agriculture, Forest Service, Pacific Southwest Forest and Range Experiment Station (Berkeley, CA), Research Paper PSW-113.