Summary of ore-mining cost data

Author:	Jackson, Charles Freeman,
Year:	1934
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6785
Series:	Information circular / Bureau of Mines ;
Report Number:	6785
Subjects:	Mines and mineral resources--United States
	Ore-dressing
Link:	https://hdl.handle.net/2027/mdp.39015086486084