Silver yield from copper ores and the effects of 64.64-cent silver on the value of copper ores produced in the United States

Author:	Pehrson, Elmer Walter,
Year:	1934
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6773
Series:	Information circular / Bureau of Mines ;
Report Number:	6773
Subjects:	Silver
	Copper
Link:	https://hdl.handle.net/2027/mdp.39015077572090