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Abandoned Subsurface Coal Mines as a Source of Water for Coal Conversion in Eastern Ohio

Thomas M. CrouchHorace R. CollinsJohn O. Helgesen

出版	State of Ohio, Department of Natural Resources, Division of Geological Survey, 1980
URL	http://books.google.com.hk/books?id=B7ZRAQAAIAAJ&hl=&source=gbs_api