@misc{indiciaed3279da37974,
  title = {Mineral resource potential map of the Burden Falls Roadless Area, Pope County, Illinois},
  author = {J. S. Klasner and T. M. Kehn and R. M. Thompson},
  year = {1983},
  doi = {10.3133/mf1565c},
  url = {https://pubs.usgs.gov/publication/mf1565C},
  note = {Source identifier: mf1565C}
}