Permissible mine equipment approved during 1943

Author:	Gleim, E. J.
Year:	1944
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7283
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7283
Subjects:	Coal mines and mining--United States--Safety measures
	Mines safety--United States--Equipment and supplies
Link:	https://hdl.handle.net/2027/mdp.39015077571001