Construction of the Wachusett-Coldbrook Tunnels

Author:	Corner, Douglas C.
Year:	1931
Document Type:	MAIN
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6399
Series:	Information circular / United States. Bureau of Mines ;
Report Number:	6399
Subjects:	Tunneling
	Mining engineering
Link:	https://hdl.handle.net/2027/mdp.39015095085364