Langwall gob degasification with surface ventilation boreholes above the Lower Kittanning coalbed /

Bibliographic Details

Main Authors:	Moore, T. D., Deul, Maurice (Author), Kissel, Fred N. (Author)
Corporate Author:	United States. Bureau of Mines
Format:	Government Document Book
Language:	English
Published:	Washington : U.S. Dept. of the Interior, Bureau of Mines, 1976.
Series:	Report of investigations (United States. Bureau of Mines) ; 8195.
Subjects:	Mine ventilation. Methane.