Progress in metal mine ventilation

Author:	Harrington, D.
Year:	1929
Document Type:	MAIN
SUDOC:	C 22.11:6136
Series:	Information circular / United States Department of Commerce, Bureau of Mines ;
Report Number:	6136
Subjects:	Coal mines and mining--Safety measures
	Mine ventilation
Link:	https://hdl.handle.net/2027/mdp.39015095078427