@misc{indiciaec63795bc9fd8,
  title = {Geologic map of the La Center quadrangle, Ballard and McCracken Counties, Kentucky},
  author = {Roger Warren Swanson},
  year = {1978},
  doi = {10.3133/gq1417},
  url = {https://pubs.usgs.gov/publication/gq1417},
  note = {Source identifier: gq1417}
}