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Rotary drilling holes in coalbeds for degasification
Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.
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Published Year
1970-1979 (2)
Subject
Boring (2) *
Coal mines and mining (1)
Degassing of coal (1)
Mine gases (1)
Mine safety (1)
Mine ventilation (1)
Author
Fields, H. H. (2) *
Aul, George N. (1)
Cervik, Joseph. (1)
Diamond, W. P. (1)
Oyler, David C., (1)
