The National Safety Competition to assist in the reduction of mine and quarry accidents

Author:	Adams, William W.
Year:	1929
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6109
Series:	Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number:	6109
Subjects:	Coal mines and mining--United States
	Coal mine accidents
Link:	https://hdl.handle.net/2027/mdp.39015077570169