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Diamond-drilling Blast Holes, Bellefonte Mine, National Gypsum Co., Centre County, Pa

McHenry Mosier

出版	U.S. Department of the Interior, Bureau of Mines, 1948
URL	http://books.google.com.hk/books?id=DMmV4bRyHhkC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN