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Effects of pruning height on the diameter growth of yellow birch

Dale S. SolomonBarton M. Blum

出版	Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1977
URL	http://books.google.com.hk/books?id=VTGrkMN89n0C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN