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- Degasification of virgin Pittsburgh coalbed through a large borehole
- Rotary drilling holes in coalbeds for degasification
- Commercial-quality gas from the multipurpose borehole located in the Pittsburgh coalbed
- Degasification and production of natural gas from an air shaft in the Pittsburgh coalbed
- Directionally controlled drilling to horizontally intercept selected strata, upper Freeport coalbed, Green County, Pa.