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A Comprehensive Study of Visitor Safety in the National Park System. [4 Volumes] ; Prepared for the National Park Service Under Subcontract (#GNK756) to the University of Idaho, Cooperative Park Studies Unit

Dominic GoldingSeth TulerRobert J. KruegerMark DudaDave LimeRobert C. Mitchell

出版	George Perkins Marsh Institute, Clark University, 2002
URL	http://books.google.com.hk/books?id=qjGHuAAACAAJ&hl=&source=gbs_api