@misc{indiciae72d8e2a69d7d,
  title = {Geologic map of the Mason quadrangle, Grant and Harrison Counties, Kentucky},
  author = {Stanley J. Luft},
  year = {1976},
  doi = {10.3133/gq1311},
  url = {https://pubs.usgs.gov/publication/gq1311},
  note = {Source identifier: gq1311}
}