Improved drilling of coal measure rocks for underground mine void detection and exploration programs /
by Pamela J. Watson, Patrick A. Tuzinski, and John E. Pahlman.

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Main Author: Watson, Pamela J.
Related Names: Pahlman, J. E. (John E.)
Tuzinski, Patrick A.
United States. Bureau of Mines.
Language(s): English
Published: [Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, [1991]
Subjects: Polyethylene oxide.
Coal-cutting bits.
Abandoned coal mines.
Mine surveying.
Physical Description: 28 p. : ill. ; 28 cm.
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