Accident statistics as an aid to prevention of accidents in bituminous-coal mines :coal-mine accident-prevention course.

Year:	1945
Document Type:	MAIN
Issuing Agency:	U.S. G.P.O.,
SUDOC:	I 28.6:47
Series:	Miners' circular ;
Report Number:	47
Subjects:	Coal mine accidents--United States
	Bituminous coal mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015077562240