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50 acres 75 acres advance growth alpine fir average bark beetle BLOCK CLEAR CUTTINGS Block cutting cookie cutter Cut selectively cut-over land Deerlodge National Forest Douglas-fir dozer piling dwarf mistletoe eliminate feet fire five-inch tube forest management Forest Service Gallatin National Forest ground surface habitat hand methods harvesting lodgepole pine inches d.b.h. Kenneth N Lewis and Clark lodgepole pine forests lodgepole pine silviculture logging damage Lop and scatter natural regeneration north Idaho Northern Rocky Mountain overmature stands partial cutting percent piling and burning pine clear cutting plots probably pulpwood reforestation reserve trees residual trees restocked result Rocky Mountain scarified ground seedbed preparation seedlings per acre selective cutting silvicultural practices skid roads skid trails Slash disposal method soil spruce stand density stand improvement stulls stumpage substantial Sulphur Springs study surface water flow thinned thrifty tion transmission line poles tree species Understocked vigor watershed White Sulphur Springs