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Regional Aspects of Pottsville and Allegheny Stratigraphy and Depositional Environments, Ohio and Kentucky

出版	U.S. Department of the Interior, U.S. Geological Survey, 1992
URL	http://books.google.com.hk/books?id=J11RAQAAIAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN