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USDA Forest Service Research Paper PSW.

Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.)

出版	Forest Service, U.S. Department of Agriculture, Pacific Forest and Range Experiment Station, 1978
URL	http://books.google.com.hk/books?id=5BX7o8SNYz8C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN