Active list of permissible explosives and blasting devices approved prior to June 30, 1938

Year:	1938
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3421
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	3421
Subjects:	Coal mines and mining--Explosives
	Explosives--United States
	Blasting--United States
Link:	https://hdl.handle.net/2027/mdp.39015086546648