Recommendation for safety in coal mining relating to placing mine haulage in intake air

Year:	1929
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6139
Series:	Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number:	6139
Subjects:	Coal mines and mining--Safety measures
	Mine haulage--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015077570284