Safety standards for anthracite mines

Year:	1948
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7449
Series:	Information circular / Bureau of Mines ;
Report Number:	7449
Subjects:	Anthracite coal
	Coal mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015077578550