Active list of permissible explosives and blasting devices approved prior to June 30, 1939 / U.S. Dept. of the Interior, Bureau of Mines.

Year:	1939
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3471
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3471
Subjects:	Coal mines and mining--Explosives
	Explosives--United States
	Blasting--United States
Links:	https://hdl.handle.net/2027/mdp.39015078492645
	no.3461-3480 1939