Falls of coal and rock on man-trips in bituminous-coal mines

Author:	Owings, C. W.
Year:	1935
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6863
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6863
Subjects:	Coal mine accidents
	Mine safety
	Mine accidents
Link:	https://hdl.handle.net/2027/mdp.39015077568692