Drillability determination :a drillability index for percussion drills

Author:	Tandanand, Sathit.
Additional Authors:	Unger, Harold F.,
Year:	1975
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:8073
Series:	Report of investigations - Bureau of Mines ;
Report Number:	8073
Subjects:	Mining machinery
	Drilling and boring
Link:	https://hdl.handle.net/2027/mdp.39015078474239