Aerial tramways in the metal-mining industry :construction and operating costs

Author:	Metzger, O. H.
Year:	1940
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7095
Series:	Information circular / United States, Bureau of Mines ;
Report Number:	7095
Subjects:	Mining machinery
	Aerial tramways
	Conveying machiner
Link:	https://hdl.handle.net/2027/mdp.39015074126007