A Bureau of Mines direct-reading azimuth protractor

Author:	Bolstad, D. D.
Additional Authors:	Mahtab, M. A.
Year:	1974
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8617
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	8617
Subjects:	Rock mechanics--Research
	Protractors
Link:	https://hdl.handle.net/2027/mdp.39015078516377