@misc{indiciaea75fb89958fa,
  title = {Digital geologic map of Fort Smith Quadrangle, east-central Oklahoma},
  author = {J. R. Cederstrand},
  year = {1997},
  doi = {10.3133/ofr96375},
  url = {https://pubs.usgs.gov/publication/ofr96375},
  note = {Source identifier: ofr96375}
}