Diamond drilling and diamond bit investigation

Additional Authors:	Obert, Leonard,
Year:	1947
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:4233
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	4233
Subjects:	Diamond bits--Testing
	Granite
	Boring
Link:	https://hdl.handle.net/2027/mdp.39015078480483