Permissible explosives :tested prior to January 1, 1917

Author:	Howell, S. P.
Year:	1917
Document Type:	USBM
Issuing Agency:	U.S.Bureau of Mines,
SUDOC:	I 28.7:169
Series:	Technical paper / United States. Bureau of Mines ;
Report Number:	169
Subjects:	Coal mines and mining--Safety measures
	Explosives
Link:	https://hdl.handle.net/2027/mdp.39015077565664