@misc{indiciae032bda884bbb,
  title = {Preliminary geologic map and report of Franklin County, Nebraska},
  author = {Richard Van Horn},
  year = {1951},
  doi = {10.3133/ofr5131},
  url = {https://pubs.usgs.gov/publication/ofr5131},
  note = {Source identifier: ofr5131}
}