@misc{indiciaece9ca590719b,
  title = {Hydrologic data for a study of pre-Illinoian glacial till in Linn County, Iowa, water year 1990},
  author = {Phillip R. Bowman},
  year = {1991},
  doi = {10.3133/ofr91459},
  url = {https://pubs.usgs.gov/publication/ofr91459},
  note = {Source identifier: ofr91459}
}