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Exploratory Drilling for Evidence of Zinc and Lead Ore in Dubuque County, Iowa

Arthur E. FlintClarence Ervin Brown

出版	U.S. Government Printing Office, 1956
URL	http://books.google.com.hk/books?id=rPZIEnzI3owC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN