Progress report 4 on investigation of detachable rock-drill bits

Author:	Mosier, McHenry.
Year:	1937
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6951
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6951
Subjects:	Rock-drills
	Drilling and boring
	Bits (Drilling and boring)
Link:	https://hdl.handle.net/2027/mdp.39015077570011