@misc{indiciae1b0828859b62,
  title = {Geologic map of Kentucky},
  author = {Robert C. McDowell and George Grabowski and Samuel L. Moore},
  year = {1981},
  doi = {10.3133/70210884},
  url = {https://pubs.usgs.gov/publication/70210884},
  note = {Source identifier: 70210884}
}