Permissible mine equipment approved to January 1, 1947 :with appended list of available flame-lamp fuels

Author:	Hooker, A. B.
Year:	1947
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7432
Series:	Information circular / Bureau of Mines ;
Report Number:	7432
Subjects:	Mine safety
	Mining machinery
	Coal mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015077577438