02203oam 2200541 450 991070708140332120180511095053.0(CKB)5470000002460671(OCoLC)896810907(OCoLC)995470000002460671(EXLCZ)99547000000246067120141123d1981 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierGeology of the eastern part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58) /by Lawrence A. Warner and Charles S. RobinsonWashington :United States Department of the Interior, Geological Survey,1981.1 online resource (vi, D31 pages) illustrations, maps +5 platesGeological Survey professional paper ;831-DEngineering geology of the Harold D. Roberts Tunnel, Colorado.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).Geology of the eastern part of the Harold D. Roberts Tunnel, Colorado Engineering geologyColoradoHarold D. Roberts TunnelGeologyColoradoHarold D. Roberts TunnelEngineering geologyfastGeologyfastHarold D. Roberts Tunnel (Colo.)ColoradoHarold D. Roberts TunnelfastEngineering geologyGeologyEngineering geology.Geology.Warner Lawrence Allen1914-1411074Robinson Charles Sherwood1920-Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910707081403321Geology of the eastern part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58)3501283UNINA