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25th Street Ogden Agriculture Forest Service airtankers analysis average basal area Brigham Young University burned campsite density Department of Agriculture diameter dispersal Douglas-fir effects estimates exclosure factors Figure Forest and Range Forestry fuel genetic gain growth height Ib/acre increased industrial infested Intermountain Research Station juniper Keywords Laboratory loam lodgepole pine measured ment Missoula moisture content monitored Montana in cooperation Montana State University mountain pine beetle National Forest nonmonitored Park percent permits Pinus pinyon plant plots pollen ponderosa pine populations predicted Prognosis Model Range Experiment Station recreation Research Station 324 Research Station Research sample seed segment shrub shrublands slope soil species spruce stand Station Research Note Tech tent tion treatment trees U.S. Department University of Idaho University of Montana University of Nevada Utah in cooperation Utah State University variables vegetation loss verbenone visitors volume Wilderness Yellowstone