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Geology, methane content, and reserves of the upper Freeport coalbed in Fayette County, Pa

Peter F. Steidl

出版	Department of the Interior, Bureau of Mines, 1977
URL	http://books.google.com.hk/books?id=x57uM7JSZzcC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN