Minnesota Geological Survey, Geological Survey (U.S.), Norvitch, R. F., & Walton, M. S. (1979). Geologic and hydrologic aspects of tunneling in the Twin Cities area, Minnesota. The Survey.
Chicago Style (17th ed.) CitationMinnesota Geological Survey, Geological Survey (U.S.), R. F. Norvitch, and Matt S. Walton. Geologic and Hydrologic Aspects of Tunneling in the Twin Cities Area, Minnesota. Reston, Va.: The Survey, 1979.
MLA (9th ed.) CitationMinnesota Geological Survey, et al. Geologic and Hydrologic Aspects of Tunneling in the Twin Cities Area, Minnesota. The Survey, 1979.
Warning: These citations may not always be 100% accurate.