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152-mm-high stump top Alberta apical tip average branchwood breast height British Columbia cells Colorado compression wood cones conifers correlated with d.b.h. density Department of Agriculture Drawing after Koch earlywood elevational zone Figure foliage Forest and Range Forest Service heartwood height in tree knotwood Koch's latewood latifolia and murrayana latifolia trees latitude lignin live branches lodgepole pine lodgepole pine forests logs longitudinal Maeglin maximum modulus of elasticity moisture content Montana murrayana trees National Forest needles ovendry weight parenchyma percent of tree percentage periderm phloem Pinus contorta pith pole pine positively correlated radial Range Experiment Station rangewide study resin canals Rocky Mountain sampled sapwood seed significantly specific gravity spiral grain standard deviation stem sections stembark stemwood stemwood volume stump height stump-root system subspecies Table tangential three diameters top to apical tracheids tree d.b.h. tree height tree-average trees 76 trees of three U.S. Department variation western Wilderness