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Use of sonic techniques in exploring coal-mine roof strata :a progress report
Development of a hydraulic device for measuring relative pressure changes in coal during mining :a progress report
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Published Year
1960-1969 (2)
Subject
Coal mines and mining (2)
Mine roof control (1)
Pressure gages (1)
Sonar (1)
Author
Miller, Thomas C. (2) *
Mongan, Charles E., (1)
Sporcic, Rudolph. (1)
