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Results of Shelterwood Harvesting of Douglas-fir in the Cascades of Western Oregon

Richard L. Williamson

出版	Pacific Northwest Forest and Range Experiment Station, U.S. Department of Agriculture, Forest Service, 1973
URL	http://books.google.com.hk/books?id=Paua1b4j8sMC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN