Prospect trenching with caterpillar-mounted angledozers

Author:	Lorain, S.H.
Year:	1944
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7294
Series:	Information circular / United States. Department of the Interior, Bureau of Mines ;
Report Number:	7294
Subjects:	Mines and mineral resources
	Prospecting
Link:	https://hdl.handle.net/2027/mdp.39015074127229