Evaluation of a penetrometer for estimating roof-bolt anchorage

Author:	Stears, J. H.
Year:	1965
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:6646
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	6646
Subjects:	Mine roof bolting
	Penetrometers--Evaluation
Link:	https://hdl.handle.net/2027/mdp.39015078512988