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USDA Forest Service Research Paper RM.

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

出版	Rocky Mountain Forest and Range Experiment Station, U.S. Department of Agriculture, 1968
URL	http://books.google.com.hk/books?id=XKmWkkIEojoC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN