Shaft sinking with a shot drill, Idaho Maryland Mine, Grass Valley, Calif.

Author:	Newsom, J. B.
Additional Authors:	Jackson, C. F.
Year:	1936
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6923
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6923
Subjects:	Percussion drilling
	Drill pipe
Link:	https://hdl.handle.net/2027/mdp.39015077569047