List of permissible mine equipment :approved to January 1, 1937

Author:	Ilsley, L. C.
Year:	1937
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6942
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6942
Subjects:	Explosives
	Coal mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015077569484