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Papers Presented at Sessions Organized by the Office of Surface Mining at the 9th Annual Meeting of the American Society for Surface Mining and Reclamation : June 14-18, 1992, Duluth, Minnesota
出版Office of Surface Mining Reclamation and Enforcement, U.S. Department of the Interior, 1992
URLhttp://books.google.com.hk/books?id=1OMJAQAAMAAJ&hl=&source=gbs_api
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