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

Title:Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.
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Note:Dept. of the Interior, Bureau of Mines, 1977
  
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Subject:Boring
Subject:Coal mines and mining
Subject:Mine gases
Subject:Mine ventilation
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