Roberts Tunnel Colorado Geological Survey Papers 3 Volumes
This lot contains 3 different Geological Survey Professional Papers on the Harold D Roberts Tunnel in Colorado. All are in fine condition and contain packets with maps and or charts. Includes History of Geologic Investigations, Engineering Design, and Construction Methods, 1974. General Geology of the Harold D Roberts Tunnel, 1974. And Summary of the Engineering Geology of the Harold D Roberts Tunnell. Many photos, Charts, Maps and detailed information.
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