What the mine foreman can do to prevent injury from falls of roof in coal mines

Author:	Paul, J. W.
Year:	1930
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6344
Series:	Information circular / Bureau of Mines ;
Report Number:	6344
Subjects:	Mine safety
	Coal mine accidents
Link:	https://hdl.handle.net/2027/mdp.39015077576216