Safety practices in shaft sinking and tunneling :West Delaware aqueduct

Author:	Rachunis, William.
Additional Authors:	Moore, James A., Sinicrope, Arthur A.
Year:	1962
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8114
Series:	Information Circular / Bureau of Mines ;
Report Number:	8114
Subjects:	Shaft sinking
	Tunneling
Link:	https://hdl.handle.net/2027/mdp.39015077564238