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Economic benefits of systematic roof bolting in Ziegler No. 3 Mine, Bell & Zoller Coal & Mining Co., Williamson County, Ill.

Author L. W. Kelly
Publisher University of Michigan Library
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Book Details
Author(s)L. W. Kelly
ISBN / ASINB003HKQQFS
ISBN-13978B003HKQQF9
MarketplaceFrance 🇫🇷