Special precautions for multiple short-delay blasting in coal mines

Author:	Nagy, John.
Additional Authors:	Van Dolah, Robert W., Hartmann, Irving.
Year:	1959
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7895
Series:	Information circular / United States. Bureau of Mines ;
Report Number:	7895
Subjects:	Blasting
	Coal mines and mining--United States--Explosives--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015078454496