- Frye, R. H. 1971. Southwestern States (R-3). Pp. 23-26. in: Forest Insect Conditions in the United Sates 1970. Landgraf, A. E. (eds.) United States Department of Agriculture, Forest Service. vi+44 pp..
- Buffam, P. E., C. K. Lister, R. E. Stevens, and R. H. Frye. 1973. Fall cacodylic acid treatments to produce lethal traps for spruce beetles . Environmental Entomology 2:259-262.
- Frye, R. H. 1971a. Biological evaluation, spruce beetle winter mortality, Fort Apache Indian Reservation, Arizona. United States Department of Agriculture, Forest Service, Southwestern Region, Albuquerque, New Mexico. 17 p.
- Frye, R. H. 1971b. Southwestern States (R-3). Pages 23-26 in A. E. Landgraf, Forest insect conditions in the United States, 1970. United States Department of Agriculture, Forest Service. vi + 44 p.
- Frye, R. H. 1974a. Mountain pine beetle, Black Hills National Forest and adjacent state and private lands. United States Department of Agriculture, Forest Service, Rocky Mountain Region, State and Private Forestry, Biological Evaluation R2-74-12. 4 p.
- Frye, R. H. 1974b. Mountain pine beetle, Pike and San Isabel National Forest, Salida Ranger District. United States Department of Agriculture, Forest Service, Rocky Mountain Region, State and Private Forestry, Biological Evaluation R2-74-8. 2 p.
- Frye, R. H. 1975. Mountain pine beetle, Pike and San Isabel and Arapaho National Forests. United States Department of Agriculture, Forest Service, Rocky Mountain Region, State and Private Forestry, Biological Evaluation R2-75-1. 5 p.
- Frye, R. H., and H. W. Flake. 1972. Mt. Baldy spruce beetle biological evaluation-population trend, stand structure and tree resource losses. United States Department of Agriculture, Forest Service, Pacific Southwest Region. 38 p.
- Frye, R. H., H. W. Flake, and C. J. Germain. 1974. Spruce beetle winter mortality resulting from record low temperatures in Arizona . Environmental Entomology 3:752-754.
- Frye, R. H., and T. D. Landis. 1975. Mountain pine beetle and dwarf mistletoe, Lake Creek Area, San Carlos Ranger District, Pike and San Isabel National Forests. United States Department of Agriculture, Forest Service, Rocky Mountain Region, State and Private Forestry, Report R2-75-4. 10 p.
- Frye, R. H., and J. M. Schmid. 1972. Polypropylene jars improve performance of bark beetle emergence cages . Journal of Economic Entomology 65:931.
- Frye, R. H., J. M. Schmid, C. K. Lister, and P. E. Buffam. 1977. Post-attack injection of Silvisar 510 (cacodylic acid) in spruce beetle (Coleoptera: Scolytidae) infested trees . Canadian Entomologist 109:1221-1225.
- Frye, R. H., and N. D. Wygant. 1971. Spruce beetle mortality in cacodylic acid-treated Engelmann spruce trap trees . Journal of Economic Entomology 64:911-916.
- Landis, T. D., R. Averill, and R. H. Frye. 1977. Central Rocky Mountains (R-2). Pages 28-33 in H. V. Toko and T. J. Rogers, Forest insect and disease conditions in the United States, 1974. United States Department of Agriculture, Forest Service. vi + 55 p.
- Landis, T. D., and R. H. Frye. 1974. Tree injury and mortality in the Dillon-Keystone area, Dillon Ranger District, White River National Forest. United States Department of Agriculture, Forest Service, Rocky Mountain Region, Report R2-74-16. 7 p.
- Lister, C. K., J. M. Schmid, C. D. Minnemeyer, and R. H. Frye. 1976. Refinement of the lethal trap tree method for spruce beetle control . Journal of Economic Entomology 69:415-418.
- Lucht, D. D., R. H. Frye, and J. M. Schmid. 1974. Emergence and attack behavior of Dendroctonus adjunctus Blandford near Cloudcroft, New Mexico . Entomological Society of America, Annals 67:610-612.
- Schmid, J. M., and R. H. Frye. 1976. Stand ratings for spruce beetles. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, Research Note RM-309. 4 p.
- Schmid, J. M., and R. H. Frye. 1977. Spruce beetle in the Rockies. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station, General Technical Report RM-49. 38 p.