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Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.

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)

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