@misc{indiciaeeca99497d730,
  title = {Ground-water levels in the United States, 1962-66, north-central states},
  author = {C. L. McGuinness},
  year = {1969},
  doi = {10.3133/wsp1976},
  url = {https://pubs.usgs.gov/publication/wsp1976},
  note = {Source identifier: wsp1976}
}