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Slope Sinking Through Water-bearing Strata at Mine 3, Bell & Zoller Coal & Mining Co., Williamson County, Ill

Joseph J. ShieldsLouis A. Turnbull

出版	U.S. Department of the Interior, Bureau of Mines, 1949
URL	http://books.google.com.hk/books?id=TXmmK1fCHpoC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN