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Effects of Grazing by Wild Ungulates in Yellowstone National Park

Francis J. Singer

出版	U.S. Department of the Interior, National Park Service, Natural Resource Program Center, Natural Resource Information Division, 1996
URL	http://books.google.com.hk/books?id=Kf8VaZXy-cUC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN