@misc{indiciae029a2af7d56f,
  title = {Geologic map of the Maulden quadrangle, southeastern Kentucky},
  author = {K. Y. Lee and C.L. Jones},
  year = {1974},
  doi = {10.3133/gq1140},
  url = {https://pubs.usgs.gov/publication/gq1140},
  note = {Source identifier: gq1140}
}