Factors retarding transmission of radio signals underground, and some further experiments and conclusions

Author:	Jakosky, Jay John,
Additional Authors:	Zellers, Donald Henry,
Year:	1924
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:2651
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	2651
Subjects:	Geophone
	Radio--Transmitters and transmission
	Radio--Receivers and reception
	Telecommunication
Link:	https://hdl.handle.net/2027/mdp.39015086547026