Accidents from falls of roof and coal

Author:	Rice, George S.
Year:	1916
Document Type:	MAIN
Issuing Agency:	U.S. G.P.O.,
SUDOC:	I 28.6:9
Series:	Miners' circular ;
Report Number:	9
Subjects:	Coal mines and mining--Safety measures
	Coal mine accidents--Prevention
Link:	https://hdl.handle.net/2027/mdp.39015077562026