Permissible explosives tested prior to January 1, 1912 and precautions to be taken in their use

Author:	Hall, Clarence.
Year:	1912
Document Type:	MAIN
Issuing Agency:	Govt. Print. Off.,
Series:	Miners' circular ;
Report Number:	6
Subjects:	Coal mines and mining--Explosives
	Explosives
Link:	https://hdl.handle.net/2027/mdp.39015077561275