Hazards of entering old mine workings

Author:	Look, Allen D.
Additional Authors:	Walker, Stanley M., Van Fleet, Leonard A.
Year:	1948
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7479
Series:	Information circular / Bureau of Mines ;
Report Number:	7479
Subjects:	Mine safety--United States
	Mineral industries--Safety measures
	Abandoned mines--United States
Link:	https://hdl.handle.net/2027/mdp.39015077577636