02130oam 2200505 450 991070679480332120171226102833.0(CKB)5470000002457505(OCoLC)896810005(OCoLC)995470000002457505(EXLCZ)99547000000245750520141123d1974 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierHistory of geologic investigations, engineering design, and construction methods of the Harold D. Roberts Tunnel, Colorado /by Ernest E. WahlstromWashington :United States Department of the Interior, Geological Survey,1974.1 online resource (iii, A13 pages) illustrations, maps +5 platesGeological Survey professional paper ;831-AEngineering geology of the Harold D. Roberts Tunnel, Colorado.Title from title screen (viewed October 2, 2014)."A historical review of the planning, geologic investigations, engineering design, and construction procedures for a 23.3-mile water tunnel that passes under the Continental Divide in the Front Range of Colorado."Engineering geologyColoradoPark CountyEngineering geologyColoradoSummit CountyEngineering geologyfastHarold D. Roberts Tunnel (Colo.)ColoradoHarold D. Roberts TunnelfastColoradoPark CountyfastColoradoSummit CountyfastEngineering geologyEngineering geologyEngineering geology.Wahlstrom Ernest E(Ernest Eugene),1909-2000,1399312Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOBOOK9910706794803321History of geologic investigations, engineering design, and construction methods of the Harold D. Roberts Tunnel, Colorado3532540UNINA