@misc{indiciaecf9adbdc539c,
  title = {Geologic map of the Drakesboro quadrangle, Muhlenberg County, Kentucky},
  author = {Dan E. Hansen},
  year = {1972},
  doi = {10.3133/gq934},
  url = {https://pubs.usgs.gov/publication/gq934},
  note = {Source identifier: gq934}
}