- Morris, O. N., and P. Olsen. 1970. Insect disease survey in British Columbia, 1964-1969. Canada Department of Fisheries and Forestry, Canadian Forestry Service, Forest Research Laboratory, Victoria, British Columbia, Information Report BC-X-47. 14 p.
- Olsen, R. C. 1969. Emergence and attack pattern of Dendroctonus ponderosae Hopk. in El Paso County, 1969. Colorado State Forest Service. 8 p.
- Schmid, J., S. Mata, W. Olsen, and D. Vigil. 1993. Phloem temperatures in mountain pine beetle-infested Ponderosa Pine. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station (Ft. Collins, CO), Research Note RM-521.
- Hall, W., C. Olsen, and T. V. Devender. 1989. Late quaternary and modern arthropods from the Ajo Mountains of southwestern Arizona . The Pan-Pacific Entomologist 63:322-347.
- Obedzinski, R., J. Schmid, S. Mata, W. Olsen, and R. Kessler. 1999. Growth of ponderosa pine stands in relation to mountain pine beetle susceptibility. United States Department of Agriculture, Forest Service, Rocky Mountain Research Station (Fort Collins, CO), General Technical Report RMRS-GTR-28. 13 pp.
- Olsen, W., J. Schmid, and S. Mata. 1996. Stand characteristics associated with mountain pine beetle infestation in ponderosa pine . Forest Science 42:310-327.
- Schmid, J., S. Mata, and W. Olsen. 1995. Microclimate and mountain pine beetles in two Ponderosa pine stands in the Black Hills. United States Department of Agriculture, Forest Service, Rocky Mountain Forest and Range Experiment Station (Ft. Collins, CO), Research Note RM-RN-532. 12 pp.