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Correlation and Geographic Extent of Some Middle and Upper Devonian and Lower Mississippian Black Shales in the Appalachian Basin

Wallace De Witt (Jr.)John B. Roen

出版	U.S. Geological Survey, 1985
URL	http://books.google.com.hk/books?id=w6VfuAAACAAJ&hl=&source=gbs_api