Gibson, K. E., W. E. Bousfield, S. J. Gast, and R. D. Oakes. 1988. Status and predicted trend of mountain pine beetle infestations in upper Yak River and Sullivan Creek drainages, Three Rivers and Rexford Ranger Districts, Kootenai National Forest, 1988. United States Department of Agriculture, Forest Service, Northern Region, Missoula, Montana, Timber, Cooperative Forestry and Pest Management Report. 75 p.