Apparent earth conductivity over coal mines as estimated from through-the-earth electromagnetic transmission tests

Author:	Durkin, John.
Year:	1984
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I28:23
Series:	Report of investigations / Bureau of Mines ;
Report Number:	8869
Subjects:	Coal mines and mining--United States
	Electromagnetic waves--Transmission--Measurement
	Earth resistance--Measurement
	Earth resistance (Geophysics)--Measurement
Link:	https://hdl.handle.net/2027/mdp.39015078471433