Hamel, Dennis R, Mark D McGregor, and United States. Forest Service. Northern Region. State & Private Forestry. Biological Notes On the Emergence of Mountain Pine Beetle and Associates From Lodgepole Pine, Gallatin Ranger District, Gallatin National Forest, Montana, 1975. : Missoula, MT. : Forest Environmental Protection, USDA, Forest Service, Northern Region, State & Private Forestry, 1976.