@misc{indiciae45c28c30a38e,
  title = {Digital geologic map of Ardmore-Sherman quadrangles, south-central Oklahoma},
  author = {J. R. Cederstrand},
  year = {1997},
  doi = {10.3133/ofr96370},
  url = {https://pubs.usgs.gov/publication/ofr96370},
  note = {Source identifier: ofr96370}
}