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Proceedings: Symposium On Sustainable Management Of Hemlock Ecosystems in Eastern North America, June 22-24, 1999, Durham, New..., General T.

出版	Northeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture, 1980
URL	http://books.google.com.hk/books?id=Hxasu3vCVlQC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN