@misc{indiciae84f446e4900d,
  title = {Geologic map of Morrill County, Nebraska},
  author = {J. B. Swinehart and R. F. Diffendal and C.C. Swisher},
  year = {1995},
  doi = {10.3133/i2496},
  url = {https://pubs.usgs.gov/publication/i2496},
  note = {Source identifier: i2496}
}