Blast-hole diamond drilling in California mines

Author:	Butner, D. W.
Year:	1948
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7451
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7451
Subjects:	Mines and mineral resources--California
	Diamond bits
	Boring
	Boring machinery
Link:	https://hdl.handle.net/2027/mdp.39015077578402