TY  - RPRT
TI  - Geologic and hydrologic aspects of tunneling in the Twin Cities area, Minnesota
AU  - Ralph F. Norvitch
AU  - Matt S. Walton
PY  - 1979
DO  - 10.3133/i1157
UR  - https://pubs.usgs.gov/publication/i1157
ID  - i1157
ER  -