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Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.
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Published Year
1970-1979 (1)
Subject
Boring (1) *
Coal mines and mining (1)
Mine gases (1)
Mine ventilation (1)
Author
Diamond, W. P. (1)
Fields, H. H. (1)
Oyler, David C., (1) *
