Routine ventilation surveying in South Wales anthracite mines

Author:	Smith, Cloyd M.
Year:	1949
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7530
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7530
Subjects:	Mines and mineral resources--Wales
	Mine ventilation
Link:	https://hdl.handle.net/2027/mdp.39015078463695