TY - BOOK AU - Wahlstrom,Ernest E. ED - United States TI - Summary of the engineering geology of the Harold D. Roberts Tunnel, Colorado U1 - 624.193 PY - 1981///. CY - Washington: PB - United States Government Printing Office, KW - Tunnels KW - Plan and construction KW - United States KW - Geological survey KW - Colorado N1 - Conduct diagr.: section showing correlation of construction progress and gross geologic features, Harold D. Roberts tunnel, Colorado; Conduct map: map showing areas of numerous bedrock exposures at surface over Harold D. Roberts tunnel area, Colorado; Includes bibliographical references (p. E15) N2 - A critical review and analysis of the application of geology during planning and construction of a major water tunnel in the Rocky Mountain West ER -