Diamond drilling of blast holes lake Superior district iron-ore mines,

Author:	Johnson, Ernest William,
Additional Authors:	Cash, Frank E.,
Year:	1945
Document Type:	USBI
SUDOC:	I 28.27:7317
Series:	U.S. Bureau of mines. Information circular
Report Number:	7317
Subjects:	Blasting
	Iron mines and mining
Link:	https://hdl.handle.net/2027/mdp.39015074127377