@misc{indiciaea9e7532fecc7,
  title = {Geologic map of the Springfield quadrangle, Washington and Marion Counties, Kentucky},
  author = {Warren Lee Peterson},
  year = {1977},
  doi = {10.3133/gq1380},
  url = {https://pubs.usgs.gov/publication/gq1380},
  note = {Source identifier: gq1380}
}