Reducing accidents from falls of roof in coal mines

Additional Authors:	Owings, C. W., Tomlinson, H., Paul, J. W.
Year:	1930
Document Type:	MAIN
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	I 28.27:6225
Series:	Information circular / Bureau of Mines ;
Report Number:	6225
Subjects:	Coal mine accidents
	Mine safety
Link:	https://hdl.handle.net/2027/mdp.39015095083419