@misc{indiciae332bb4f8d6da,
  title = {Geologic map of the Powersburg 7 1/2-minute Quadrangle and part of the Pall Mall 7 1/2-minute Quadrangle, Wayne and Clinton counties, Kentucky},
  author = {Richard Quintin Lewis},
  year = {1976},
  doi = {10.3133/ofr76265},
  url = {https://pubs.usgs.gov/publication/ofr76265},
  note = {Source identifier: ofr76265}
}