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Records of backcountry use can assist trail managers

H. J. PlumleyH. T. PeetR. E. Leonard

出版	Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1978
URL	http://books.google.com.hk/books?id=dq94JzYxOd8C&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN