Aerial tramways in the metal-mining industry.

Author:	Metzger, O. H.
Year:	1937
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6948
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6948
Subjects:	Mining machinery
	Conveying machinery
	Aerial tramways
Link:	https://hdl.handle.net/2027/mdp.39015077569534