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Records of Backcountry Use Can Assist Trail Managers
H. J. Plumley
H. T. Peet
R. E. Leonard
Northeastern Forest Experiment Station (Radnor, Pa.)
出版
Forest Service, U.S. Department of Agriculture, Northeastern Forest Experiment Station
, 1978
URL
http://books.google.com.hk/books?id=4DVZ0AEACAAJ&hl=&source=gbs_api