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Geology of the eastern part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58)
1 online resource (vi, D31 pages) : illustrations, maps + 5 plates.
by Lawrence A. Warner and Charles S. Robinson.
Title from title screen (viewed October 14, 2014).
"A description of the geology of and engineering practices used in driving the eastern part of the tunnel through a sequence of almost entirely Precambrian rocks."
Includes bibliographical references ( page D31).
Geological Survey professional paper ; 831-D
Engineering geology of the Harold D. Roberts Tunnel, Colorado