@misc{indiciae96278b83efcd,
  title = {Water-resources program of the Geological Survey in the Midwestern States},
  author = {C. G. Paulsen},
  year = {1955},
  doi = {10.3133/ofr55137},
  url = {https://pubs.usgs.gov/publication/ofr55137},
  note = {Source identifier: ofr55137}
}