Outbreaks of the western spruce budworm in the American northern Rocky Mountain area from 1922 through 1971 /
Philip C. Johnson, and Robert E. Denton.

APA Citation

Johnson, P. C. (Philip Cornwell)., Denton, R. E.. (1975). Outbreaks of the western spruce budworm in the American northern Rocky Mountain area from 1922 through 1971. Ogden, Utah: Intermountain Forest & Range Experiment Station, Forest Service, U.S. Dept. of Agriculture.

MLA Citation

Johnson, Philip C. (Philip Cornwell), 1907-, and Robert E. Denton. Outbreaks of the Western Spruce Budworm In the American Northern Rocky Mountain Area From 1922 Through 1971. Ogden, Utah: Intermountain Forest & Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1975.