@misc{indiciaef971dfe1a45c,
  title = {Geology and ground-water resources of Cerro Gordo County, Iowa},
  author = {H.G. Hershey and K.D. Wahl and W. L. Steinhilber},
  year = {1970},
  url = {https://pubs.usgs.gov/publication/70174097},
  note = {Source identifier: 70174097}
}