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1978 National Camping Market Survey

Wilbur F. LaPageGerald Leon Cole

出版	Forest Service, U.S. Department of Agriculture, Northeastern Forest Experiment Station, 1979
URL	http://books.google.com.hk/books?id=nh8-inBvRvYC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN