@misc{indiciae1f2b886fbd9c,
  title = {Geologic map of the Sturgis quadrangle, western Kentucky},
  author = {Thomas M. Kehn},
  year = {1975},
  doi = {10.3133/gq1273},
  url = {https://pubs.usgs.gov/publication/gq1273},
  note = {Source identifier: gq1273}
}