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Rotary drilling holes in coalbeds for degasification

Grouting horizontal drainage holes in coalbeds

Published Year

• 1970-1979 (2) *

Subject

• Boring (1)
• Coal mines and mining--Safety measures (1)
• Degassing of coal (1)
• Methane (1)
• Mine gases (1)
• Mine safety (1)

Author

• Aul, George N. (2) *
• Cervik, Joseph, (1)
• Cervik, Joseph. (1)
• Fields, H. H. (1)

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