@misc{indiciaeb3c0e1897999,
  title = {Map showing bedrock topography of parts of the West Franklin, Caborn, and Mount Vernon quadrangles, Henderson and Union counties, Kentucky},
  author = {R. L. Norris},
  year = {1974},
  doi = {10.3133/i864},
  url = {https://pubs.usgs.gov/publication/i864},
  note = {Source identifier: i864}
}