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U.S.D.A. Forest Service Research Note PNW.

Pacific Northwest Forest and Range Experiment Station (Portland, Or.)

出版	Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, Forest Service, 1963
URL	http://books.google.com.hk/books?id=lJgmAQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN