Rotary drilling holes in coalbeds for degasification /
by Joseph Cervik, H.H. Fields, and G.N. Aul.

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Main Author: Cervik, Joseph.
Related Names: Aul, George N., joint author.
Fields, H. H.
United States. Bureau of Mines.
Language(s): English
Published: [Washington] : U.S. Bureau of Mines, [1975].
Subjects: Mine safety.
Boring.
Degassing of coal.
Physical Description: 21 p. : ill. ; 27 cm.
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