Precautions to be taken when approaching old mine workings

Author:	Harrington, D.
Additional Authors:	Warncke, R. G.
Year:	1944
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7288
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7288
Subjects:	Abandoned mines--United States
	Mine safety--United States
	Mines and mineral resources--United States--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015077570607