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Proceedings of the 1990 Northeastern Recreation Research Symposium, February 25-28, 1990, State Parks Management and Research Institute, Saratoga Springs, New York
出版U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station, 1990
URLhttp://books.google.com.hk/books?id=KLN2IEHxvp0C&hl=&source=gbs_api
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