@misc{indiciaefc6d15c31a08,
  title = {Hydrogeologic maps of the Minneapolis-St. Paul artesian basin, Minnesota},
  author = {R.F. Norvitch and Alex Brietkrietz},
  year = {1972},
  doi = {10.3133/ofr72272},
  url = {https://pubs.usgs.gov/publication/ofr72272},
  note = {Source identifier: ofr72272}
}