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The Effect of Spiral Grain on Pole Twist and Bending Strength
David P. LoweryErwin Carl Olaf Erickson
出版Intermountain Forest & Range Experiment Station, Forest Service, U.S. Department of Agriculture, 1967
URLhttp://books.google.com.hk/books?id=cHki-6072ZoC&hl=&source=gbs_api
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