Falls of roof and coal in bituminous coal-mines

Author:	Adams, William W.
Year:	1925
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	I 28.23:2711
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	2711
Subjects:	Bituminous coal
	Coal mine accidents--Statistics
	Bituminous coal mines and mining
	Bituminous coal--Pennsylvania
	Mine accidents
	Coal mine accidents
Link:	https://hdl.handle.net/2027/mdp.39015086546978