@misc{indiciaea6771c75986f,
  title = {Plan of study for the northern Midwest regional aquifer-system analysis},
  author = {W. L. Steinhilber and H. L. Young},
  year = {1979},
  doi = {10.3133/wri7944},
  url = {https://pubs.usgs.gov/publication/wri7944},
  note = {Source identifier: wri7944}
}