Effects of ancient stream channel deposits on mine roof stability
Subtitle: a case study
By: by David K. Ingram and Frank E. Chase.
Contributors: Chase, Frank E.
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;; 9092; Report of investigations (United States. Bureau of Mines) ;; 9092.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1987
Place of publication: [Pittsburgh, Pa.]
Language: eng
Number of pages: 33
Subjects: Mine roof control.; River channels.; River channels -- Pennsylvania -- Pittsburgh Region.
Notes: Bibliography: p. 32.
Two plates on folded leaves in pocket.