Stoppings for ventilating coal mines

Additional Authors:	Mitchell, Donald W., Kawenski, Edward M., Frances, Angelo., Bercik, George R.
Year:	1965
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:6710
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	6710
Subjects:	Coal mines and mining
	Mine ventilation
Link:	https://hdl.handle.net/2027/mdp.39015078525634