Comparison of aerial and ground surveying of subsidence over an active longwall

Author:	LaScola, John C.
Year:	1988
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:9214
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	9214
Subjects:	Longwall mining--Pennsylvania--Waynesburg Region--Safety measures
	Mine subsidences--Pennsylvania--Waynesburg Region--Measurement
Link:	https://hdl.handle.net/2027/mdp.39015078476838