Improved drilling of coal measure rocks for underground mine void detection and exploration programs

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086 0 ‡aI 28.22:9370
100 1 ‡aWatson, Pamela J.
245 1 0 ‡aImproved drilling of coal measure rocks for underground mine void detection and exploration programs / ‡cby Pamela J. Watson, Patrick A. Tuzinski, and John E. Pahlman.
260 ‡a[Washington, D.C.] : ‡bU.S. Dept. of the Interior, Bureau of Mines, ‡c[1991]
300 ‡a28 p. : ‡bill. ; ‡c28 cm.
490 0 ‡aReport of investigations / Bureau of Mines ; ‡v9370
504 ‡aIncludes bibliographical references (p. 11).
538 ‡aMode of access: Internet.
650 0 ‡aPolyethylene oxide.
650 0 ‡aCoal-cutting bits.
650 0 ‡aAbandoned coal mines.
650 0 ‡aMine surveying.
700 1 ‡aPahlman, J. E. ‡q(John E.)
700 1 ‡aTuzinski, Patrick A.
710 1 ‡aUnited States. ‡bBureau of Mines.
899 ‡a39015077558198
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