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U.S. Forest Service Research Paper RM.

Rocky Mountain Forest and Range Experiment Station (Fort Collins, Colo.)

出版	Rocky Mountain Forest and Range Experimemt Station, Forest Service, U.S. Department of Agriculture, 1963
URL	http://books.google.com.hk/books?id=wrgmAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN