APA

Tunnock, S., & States. Forest Service. Northern Region. State & Private Forestry, U. (1975). Impact of egg viability, egg parasitism, and virus on 1975 Douglas-fir tussock moth defoliation potential in the lower Flathead Valley, Montana. : Missoula, MT. : Forest Environmental Protection, USDA, Forest Service, Northern Region, State & Private Forestry.