A method for surveying drill holes by oriented drill rods

Author:	Dahners, L. A.
Additional Authors:	Cohen, C. J.
Year:	1944
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3773
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3773
Subjects:	Boring
	Prospecting
	Drill pipe
Link:	https://hdl.handle.net/2027/mdp.39015078496711