Safe electrical practices in two Arizona open-pit mines

Author:	Hyvarinen, John.
Year:	1949
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7494
Series:	Information circular / Bureau of Mines ;
Report Number:	7494
Subjects:	Copper mines and mining--Arizona--Safety measures
	Strip mining--Arizona--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015078534743