Subsidence over four room-and-pillar sections in southwestern Pennsylvania

Author:	Moebs, Noel N.
Year:	1981
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:8645
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	8645
Subjects:	Coal mines and mining--Pennsylvania--Safety measures
	Mine subsidences--Pennsylvania--Measurement
Link:	https://hdl.handle.net/2027/mdp.39015078471995