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INVESTIGATION OF LONGWALL GATEROAD ROOF SUPPORT CHARACTERISTICS AT POWHATAN NO.4 MINE INSTRUMENTATION PLAN

By: Chekan,G. J.
Contributor(s): Babich,D. R.
Material type: materialTypeLabelBookSeries: U.S.Bureau Of Mines Report Of Investigations Bmri-8628. Publisher: U.S. Bureau Of Mines, Washington, D.C. 1902Description: 9.Subject(s): United States Department Of InteriorDDC classification: TR | RI-8628
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