Underground loading devices in metal mines

Author:	Colburn, C. Lorimer.
Year:	1921
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:2300
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	2300
Subjects:	Mining machinery
	Mining machinery--Safety measures
	Mine safety--Equipment and supplies
	Mining machinery--Testing
Link:	https://hdl.handle.net/2027/mdp.39015086555268