The Online Books Page

Books by Philip C. Johnson:

Books in the extended shelves:

• Johnson, Philip C. (Philip Cornwell), 1907-: Bark beetle risk in mature ponderosa pine forests in western Montana (Intermountain Forest & Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1972), also by Intermountain Forest and Range Experiment Station (Ogden, Utah) (page images at HathiTrust)
• Johnson, Philip C. (Philip Cornwell), 1907-: Distribution of bark beetle attacks on ponderosa pine trees in Montana (U.S. Dept. of Agriculture, Forest Service, Intermountain Forest & Range Experiment Station, 1967), also by Intermountain Forest and Range Experiment Station (Ogden, Utah) (page images at HathiTrust)
• Johnson, Philip C. (Philip Cornwell), 1907-: Outbreaks of the western spruce budworm in the American northern Rocky Mountain area from 1922 through 1971 (Intermountain Forest & Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1975), also by Robert E. Denton (page images at HathiTrust)
• Johnson, Philip C. (Philip Cornwell), 1907-: Some causes of natural tree mortality in old-growth ponderosa pine stands in western Montana (U.S. Dept. of Agriculture, Forest Service, Intermountain Forest & Range Experiment Station, 1966), also by Intermountain Forest and Range Experiment Station (Ogden, Utah) (page images at HathiTrust)

Find more by Philip C. Johnson at your library, or elsewhere.