Some studies on emergency mine communications

Author:	Coggeshall, E. J.
Additional Authors:	Harrison, L. H., Felegy, E. W.
Year:	1948
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:4135
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	4135
Subjects:	Radio in mining
	Mine communication systems
	Mine safety--Equipment and supplies
Link:	https://hdl.handle.net/2027/mdp.39015078490607