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U.S. Forest Service Resource Bulletin NC.

North Central Forest Experiment Station (Saint Paul, Minn.).

出版	North Central Forest Experiment Station, Forest Service, U.S. Department of Agriculture., 1966
URL	http://books.google.com.hk/books?id=39oQ1K6ALY4C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN