Coal mine roof instability
Subtitle: categories and causes
By: by Noel N. Moebs and Raymond M. Stateham.
Contributors: Stateham, Raymond M.
Series: Information circular / Bureau of Mines ;; 9076; Information circular (United States. Bureau of Mines) ;; 9076.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1986
Place of publication: Pgh. [i.e. Pittsburgh] Pa
Language: eng
Number of pages: 15
Subjects: Coal mines and mining -- Safety measures.; Mine roof control.; Coal -- Geology.
Notes: Bibliography: p. 12.