Manganese :general Information

Author:	Ridgway, Robert H.
Year:	1933
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
Series:	Information circular ;
Report Number:	6729
Subjects:	Manganese ores
	Manganese industry--History
Link:	https://hdl.handle.net/2027/mdp.39015074128268