@misc{indiciae55c433a08acb,
  title = {Water-table map of Milwaukee County, Wisconsin},
  author = {Marvin G. Sherrill and J.J. Schiller and John R. Erickson},
  year = {1978},
  doi = {10.3133/wri7940},
  url = {https://pubs.usgs.gov/publication/wri7940},
  note = {Source identifier: wri7940}
}