Mechanical mining in some bituminous-coal mines.

Additional Authors:	Shields, J. J., Dowd, J. J., Haley, W. A., Magnuson, M. O.
Year:	1954
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7696
Series:	Information circular / United States. Bureau of Mines ;
Report Number:	7696
Subjects:	Coal-mining machinery
	Bituminous coal industry--United States
Link:	https://hdl.handle.net/2027/mdp.39015077562430