List of permissible mine equipment approved during 1937

Author:	Ilsley, L. C.
Year:	1938
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7007
Series:	Information circular / Bureau of Mines ;
Report Number:	7007
Subjects:	Mining machinery
	Mines and mineral resources--Equipment and supplies
Link:	https://hdl.handle.net/2027/mdp.39015077575671