Grouting horizontal drainage holes in coalbeds
By: by George N. Aul and Joseph Cervik
Contributors: Cervik, Joseph, joint author; United States. Bureau of Mines
Series: Report of investigations - Bureau of Mines ; 8375
Publisher: Dept. of the Interior, Bureau of Mines
Published: 1979
Place of publication: [Washington]
Language: eng
Number of pages: 16
Subjects: Coal mines and mining -- Safety measures; Mine gases; Methane
Notes: Bibliography: p. 16