Use of sonic techniques in exploring coal-mine roof strata :a progress report

Author:	Mongan, Charles E.,
Additional Authors:	Miller, Thomas C.
Year:	1960
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:5617
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	5617
Subjects:	Mine roof control
	Sonar
	Coal mines and mining
Link:	https://hdl.handle.net/2027/mdp.39015078528455