Mine Safety Board decision 32 :prevention of coal-dust explosions by rock dusting

Year:	1940
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7109
Series:	Information circular / Bureau of Mines ;
Report Number:	7109
Subjects:	Coal mines and mining--Safety measures
	Mine dusts
	Mine explosions
	Dust explosions
Link:	https://hdl.handle.net/2027/mdp.39015078534784