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Improvement in Butt-log Grade with Increase in Tree Size, for Six Hardwood Species

出版	Northeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture, 1965
URL	http://books.google.com.hk/books?id=Rlmv6dzQ6_wC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN