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Abies Amman basal area beetle epidemics beetle infestation beetle outbreaks beetle populations big game clearcut Continental Divide cover D. M. Cole damage Department of Agriculture develop Douglas-fir dwarf mistletoe effects elevation elk and deer even-aged Figure fire Flathead National Forest forage Forest and Range Forest Service Forestry and Pest Gallatin National Forest h.t. occurs habitat types harvest hazard rating inches 20 cm Intermountain Forest lodgepole pine forests lodgepole pine stands losses managed stands ment Missoula moist mortality mountain pine beetle mule deer Northern Region Missoula northwestern Montana overstory partial cutting percent phloem Pinus pole pine prevent Pseudotsuga PSME/PHMA Range Experiment Station regeneration resource management resource values Safranyik Sanitation cutting scoparium silvicultural practices silvicultural systems slopes subalpine fir successional role susceptibility tain pine beetle tion trees Tsuga types where lodgepole U.S. Department understory University of Idaho unmanaged usually western larch whitebark pine wildlife