Mine subsidence--extent and cost of control in a selected area.

Author:	Cochran, William,
Year:	1971
Document Type:	USBI
Issuing Agency:	U.S. Bureau of Mines; [for sale by the Supt. of Docs., U.S. Govt. Print. Off.,
SUDOC:	I 28.27:8507
Series:	[United States. Bureau of Mines] Information circular ;
Report Number:	8507
Subjects:	Coal mines and mining--Pennsylvania
	Mining engineering
	Subsidences (Earth movements)
Link:	https://hdl.handle.net/2027/mdp.39015078461657