@misc{indiciaec835455e1109,
  title = {Geologic map of the Gravel Switch quadrangle, central Kentucky},
  author = {Samuel L. Moore},
  year = {1978},
  doi = {10.3133/gq1506},
  url = {https://pubs.usgs.gov/publication/gq1506},
  note = {Source identifier: gq1506}
}