Mine communications :proceedings: Bureau of Mines Technology Transfer Seminar, Bruceton, Pa., March 21-22, 1973

Year:	1974
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8635
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	8635
Subjects:	Mines and mineral resources--United States
	Mine communication systems
	Mining engineering
Link:	https://hdl.handle.net/2027/mdp.39015078516476