@misc{indiciae0dffe130965b,
  title = {Geologic map of the Burden Falls Roadless Area, Pope County, Illinois},
  author = {J. S. Klasner},
  year = {1983},
  doi = {10.3133/mf1565a},
  url = {https://pubs.usgs.gov/publication/mf1565A},
  note = {Source identifier: mf1565A}
}