Inverted pyramid-shaped plugs for closing abandoned mine shafts
Subtitle: Galena, KS, demonstration project
By: by W.M. Dressel and John S. Volosin.
Contributors: Volosin, John S.
Series: Information circular ;; 8998; Information circular (United States. Bureau of Mines) ;; 8998.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1985
Place of publication: Pittsburgh, Pa
Language: eng
Number of pages: 14
Subjects: Mine filling.
Notes: Bibliography: p. 14.