@misc{indiciae04313635a0aa,
  title = {Regional water-level changes for the Cambrian-Ordovician aquifer in Iowa, 1975 to 1997},
  author = {Michael J. Turco},
  year = {1999},
  doi = {10.3133/wri994134},
  url = {https://pubs.usgs.gov/publication/wri994134},
  note = {Source identifier: wri994134}
}