- Washburn, F. L. 1903. Injurious insects of 1903: Xyleborus xylographus Say. Minnesota Agricultural Experiment Station, Bulletin 8460, 81, 93.
- Massey, C. L., N. D. Wygant, and R. I. Washburn. 1950. Tests with ethylene dibromide emulsions for control of the Black Hills beetle in ponderosa pine. United States Department of Agriculture, Bureau of Entomology and Plant Quarantine, Fort Collins, Colorado.
- Washburn, R. H., and G. L. Downing. 1960. Summary of insect conditions, 1959. Alaska. Cooperative Economic Insect Report 10(6):74-75.
- Washburn, R. I. 1963. Intermountain States. Pages 13-15 in J. W. Bongberg, "Forest insect conditions in the United States, 1962. United States Department of Agriculture, Forest Service. 30 p.
- Washburn, R. I. 1965. Douglas-fir beetle problems, Dixie National Forest (Utah). United States Department of Agriculture, Forest Service, Intermountain Region, Division of Timber Management, Ogden, Utah. 15 p. (typewritten).
- Washburn, R. I., and J. A. E. Knopf. 1958. Engelmann spruce beetle conditions in the spruce stands of Forest Service Region 4. United States Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, Ogden, Utah, Report 10.
- Washburn, R. I., and J. A. E. Knopf. 1959. Mountain pine beetle conditions in the lodgepole pine stands of Forest Service Region 4. United States Department of Agriculture, Forest Service, Intermountain Forest and Range Experiment Station, Ogden, Utah.