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Improved drilling of coal measure rocks for underground mine void detection and exploration programs
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Published Year
1990-1999 (1)
Subject
Abandoned coal mines (1) *
Coal-cutting bits (1)
Mine surveying (1)
Polyethylene oxide (1)
Author
Pahlman, J. E. (1) *
Tuzinski, Patrick A. (1)
Watson, Pamela J. (1)
