Hamel, Dennis R., and United States. Forest Service. Northern Region. State & Private Forestry. 1977. Status of Mountain Pine Beetle Infestations In Second-Growth Ponderosa Pine Stands, Little Rocky Mountains, Fort Belknap Reservation, Montana, 1977. : Missoula, MT. : Forest Insect & Disease Management, USDA, Forest Service, Northern Region, State & Private Forestry.