Kettlebottoms
Subtitle: their relation to mine roof and support
By: by Frank E. Chase and Gary P. Sames.
Contributors: Sames, Gary P.
Series: Report of investigations ;; 8785; Report of investigations (United States. Bureau of Mines) ;; 8785.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1983
Place of publication: [Avondale, Md.]
Language: eng
Number of pages: 12
Subjects: Coal mines and mining -- Safety measures.; Kettlebottoms (Mining); Mine roof control.
Notes: Bibliography: p. 12.