Sinking a Large-Diameter Concrete-Lined Access Shaft: Harold D. Roberts Tunnel, Colorado

Author:	Bolmer, R. L.
Year:	1961
Document Type:	N/A
SUDOC:	I 28.27:8029
Series:	United States Bureau of Mines Reports
Report Number:	I. C. 8029
Subjects:	Shaft sinking.
	Tunnels -- Colorado.
	Water diversion -- Colorado.
	Water-supply engineering -- Colorado.
Link:	http://digital.library.unt.edu/ark:/67531/metadc170737/