Electrical blasting practice as some coal mines in state of Washington

Author:	Ash, S. H.
Year:	1930
Document Type:	USBI
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6264
Series:	Information circular / Bureau of Mines ;
Report Number:	6264
Subjects:	Blasting
	Coal mines and mining--Washington (State)
Link:	https://hdl.handle.net/2027/mdp.39015077576414