Subsidence over four room-and-pillar sections in southwestern Pennsylvania
By: by Noel N. Moebs.
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;; 8645; Report of investigations (United States. Bureau of Mines) ;; 8645.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1981
Place of publication: [Washington, D.C.]
Language: eng
Number of pages: 23
Subjects: Mine subsidences -- Pennsylvania -- Measurement.; Coal mines and mining -- Pennsylvania -- Safety measures.