- Knopf, H. 1967. Forest insects of Iraq . Mesopotamia, Mosul 2:10-17.
- Knopf, J. A. E. 1978. Forest insect and disease conditions: Intermountain Region, 1977. United States Department of Agriculture, Forest Service, State and Private Forestry, Intermountain Region, Ogden, Utah. 13 p.
- Knopf, J. A. E. 1981. Forest insect and disease conditions: Intermountain Region, 1980. United States Department of Agriculture, Forest Service, State and Private Forestry, Intermountain Region, Ogden, Utah. 14 p.
- Knopf, J. A. E. 1982. Attraction and containment of Ips beetles by large slash piles. United States Department of Agriculture, Forest Service, State and Private Forestry, Intermountain Region, Forest Pest Management Report 82-8. 4 p.
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- Knopf, J. A. E., and G. B. Pitman. 1972. Aggregation pheromone for manipulation of the Douglasfir beetle . Journal of Economic Entomology 65:723-726.
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- 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.