Power-shovel and dragline placer mining

Author:	Gardner, E. D.
Additional Authors:	Allsman, Paul Trekell,
Year:	1938
Document Type:	USBI
Issuing Agency:	United States Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7013
Series:	Information Circular / Bureau of Mines ;
Report Number:	7013
Subjects:	Gold mines and mining
	Placer deposits
Link:	https://hdl.handle.net/2027/mdp.39015077575820