Working an underground mine 6 years without lost-time accidents

Author:	Herbert, Charles Arthur,
Year:	1933
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6677
Series:	Information circular / Bureau of Mines ;
Report Number:	6677
Subjects:	Coal mine accidents
	Mine safety
Link:	https://hdl.handle.net/2027/mdp.39015095086073