02215oam 2200553 450 991070695830332120180412124510.0(CKB)5470000002459894(OCoLC)896810639(OCoLC)995470000002459894(EXLCZ)99547000000245989420141123d1981 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierGeology of the western part of the Harold D. Roberts Tunnel, Colorado (Stations 0+00 to 690+00) /by Ernest E. Wahlstrom, Charles S. Robinson, and V. Quentin HornbackWashington :United States Department of the Interior, Geological Survey,1981.1 online resource (vii, C58 pages) illustrations, maps +11 platesGeological Survey professional paper ;831-C.Engineering geology of the Harold D. Roberts Tunnel, Colorado.Title from title screen (viewed October 6, 2014)."A description of the geology of and engineering practices used in the western part of the tunnel."Includes bibliographical references (page C58).Geology of the western 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.Wahlstrom Ernest E(Ernest Eugene),1909-2000,1399312Hornback V. QuentinRobinson Charles Sherwood1920-Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910706958303321Geology of the western part of the Harold D. Roberts Tunnel, Colorado (Stations 0+00 to 690+00)3464287UNINA