Dooling, Oscar J.; Eder, Robert G.; United States. Forest Service. Northern Region. State & Private Forestry(Missoula, Mont. : USDA Forest Service, Northern Region, State & Private Forestry, 1981)
Gibson, K. E. (Kenneth E.); McGregor, Mark D.; United States. Forest Service. Northern Region. State & Private Forestry(Missoula, MT. : Forest Insect & Disease Management, USDA, Forest Service, Northern Region, State & Private Forestry, 1979)