@misc{indiciaedface87ba0c2,
  title = {Geologic map of the Clarion River Roadless Area, Elk County, Pennsylvania},
  author = {S. P. Schweinfurth and N. L. Hickling and M.A. Person},
  year = {1982},
  doi = {10.3133/mf1444a},
  url = {https://pubs.usgs.gov/publication/mf1444A},
  note = {Source identifier: mf1444A}
}