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ASTM average specific gravity breast height core specific gravity correlation Density Study determine developed diameter Douglas-fir effect extractives factors fiber forest enterprise forest inventory Forest Products Laboratory Forest Survey Forestry Correspondent forestry schools glued laminated timber growth rate hardwoods important increment core loblolly pine lumber measure methods Mississippi modulus of elasticity modulus of rupture moisture Nondestructive Testing panel paper percent Phase pith plots plywood problems procedures Project pulp range regression relationship reported sawtimber shortleaf significant slash pine Slide softwoods Southern Pine Southern Pine Plywood sp.gr Specific gravity variation stiffness strength properties strength values structural summerwood Symposium timber evaluation timber quality tracheid tree specific gravity U.S. Department U.S. Forest Service unit area University variables Virginia pine volume Washington western hemlock Western Wood Density white fir wood characteristics wood density data Wood Density Survey wood products wood properties wood quality research Zobel