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acres Artemisia tridentata aspen average basal area Bob Marshall camps campsites Canyon Ceanothus Ceanothus velutinus chips conifer Creek damage defoliation Department of Agriculture diameter growth distance double ellipse Douglas-fir drop height endodermis estimate evaluate feller-buncher Figure fire intervals fireline foliage Forest and Range Forest Service FP FP FP H H H habitat habitat type Idaho impact Intermountain Forest Intermountain Station landing ldaho lodgepole pine median mesophyll Missoula Montana in cooperation needles nutrients Ogden percent perimeter planting date ponderosa pine predicted problems Purshia tridentata Range Experiment Station regression release retardant rock sample saw log seedlings shrubs skidders skidding slope soil species spread stands storage subalpine subalpine fir tion trail U.S. Department units University of Montana Utah in cooperation variables vegetation weathered western larch western redcedar wilderness wind windspeed winter injury zone