Roof-span studies in limestone

Author:	Merrill, Robert H.
Year:	1957
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:5348
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	5348
Subjects:	Mine roof control
	Limestone--Testing
Link:	https://hdl.handle.net/2027/mdp.39015078541359