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acre Alton coal field aspen ATCA ATTR average biomass Bob Marshall complex Bob Marshall Wilderness Castle Valley cercocarpus clearcutting corrosion density Department of Agriculture differences Douglas-fir duff consumption duff depth ELJU Engelmann spruce estimates Figure fire Forest and Range Forest Service globemallow grand fir grass species growing season height growth herbicide hikers Idaho inches increased Intermountain Forest KOPR loam lodgepole pine Lubrecht microsites mineral soil moisture content Montana mountain-mahogany Multiple Single Multiple National Forest Nevada nonharvested plots Ogden Penoyer soil penstemon percent percentage pinyon plant ponderosa pine predicted Range Experiment Station Red-osier dogwood registration saltbush sample Scapegoat Wilderness seed seedbeds seedlings segment shrub Single Multiple Single soil materials stand study area subalpine fir subsoil survival tion topsoil trail transects treatment tree harvest U.S. Department Utah juniper variables vegetation visitors visual volume equations western western larch wilderness woody fuel yield