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acre annual average bark birch Central characteristics Code color compression wood crown deer determine diameter differences effect equation estimated Experiment factors feet fiber Figure fire Forest Exp Group growing growth hardwoods harvest height illus important improvement inches included increase indicate industry kill Lake land length less logs maple mean measured method Michigan Minnesota moisture natural North northern percent period pine plants present pulp range recorded red oak reported samples season seedlings selected Service shade showed soil southern Space species specific gravity sprouts square stands Station stem thinning timber tion tracheid treatment trees U.S.D.A. Forest Serv values variation veneer volume walnut white oak white-tailed deer width wildlife Wisconsin wood yield