@misc{indiciaeb85da50ae257,
  title = {Geologic map of the Sandgap quadrangle, Jackson County, Kentucky},
  author = {James Louis Gualtieri},
  year = {1973},
  doi = {10.3133/gq1100},
  url = {https://pubs.usgs.gov/publication/gq1100},
  note = {Source identifier: gq1100}
}