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

Published Year

• 1950-1959 (1) *

Subject

• Coal mines and mining--Safety measures (1) *
• Mine accidents--Illinois (1)
• Mine roof bolting (1)

Author

• Kelly, L. W. (1) *

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