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Dispersed Recreation on Three Forest Road Systems in Washington and Oregon

其他書名	First Year Data
出版	U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1976
URL	http://books.google.com.hk/books?id=9hD2NSctl_kC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN