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Agric average bark basal area board-foot branches budworm casebearer clearcut cones Coram Experimental Forest crown cutting methods Denton diameter growth Douglas-fir dwarf mistletoe Engelmann spruce Figure Flathead National Forest germination growing season growth rate habitat types Haig height growth inches d.b.h. increment Intermt Kootenai National Forest larch casebearer larch crop trees larch grows larch trees Larsen lodgepole pine logging mineral soil Missoula moisture Mont Montana myrsinites National Forest northern Idaho northern Rocky Mountains Ogden overmature partial cuttings planting Pole length potential prescribed burning Range Exp regeneration scarification Schmidt seed crop seed source seed trees seedbed seedling survival Serv Shearer silvicultural slash slopes subalpine fir temperature thinning timber tion treatment trees per acre trees Percent U.S. Dep understory USDA Forest Service usually Utah volume western larch western larch forests western larch seed western Montana western redcedar western white pine