Safety in tunneling

Author:	Brunton, David W.
Additional Authors:	Davis, John A.
Year:	1913
Document Type:	MAIN
Issuing Agency:	Govt. Print. Off.,
Series:	Miners' circular ;
Report Number:	13
Subjects:	Coal mines and mining--Safety measures
	Tunneling
Link:	https://hdl.handle.net/2027/mdp.39015077562000