@misc{indiciae32432cea21eb,
  title = {Ground-water levels in the United States, 1956, north-central states},
  author = {Philip E. LaMoreaux},
  year = {1959},
  doi = {10.3133/wsp1456},
  url = {https://pubs.usgs.gov/publication/wsp1456},
  note = {Source identifier: wsp1456}
}