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Rotary drilling holes in coalbeds for degasification
Grouting horizontal drainage holes in coalbeds
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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)
