Rotary drilling holes in coalbeds for degasification
By: by Joseph Cervik, H. H. Fields, and G. N. Aul.
Contributors: Fields, H. H. joint author.; Aul, George N. joint author.; United States. Bureau of Mines
Series: Report of investigations - Bureau of Mines -- 8097; Report of investigations (United States. Bureau of Mines) -- 8097.
Publisher: U.S. Bureau of Mines
Published: 1975
Place of publication: [Washington]
Language: eng
Number of pages: 21
Subjects: Boring.; Coal mines and mining -- Safety measures.
Notes: Includes bibliography.