Effect on workers of air conditions

Author:	Sayers, R. R.
Year:	1931
Document Type:	MAIN
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6439
Series:	Information circular / Bureau of Mines ;
Report Number:	6439
Subjects:	Mine gases--United States
	Mine ventilation--United States
Link:	https://hdl.handle.net/2027/mdp.39015095085851