@misc{indiciaed493b93aced0,
  title = {Geology of the Madisonville East quadrangle, Kentucky},
  author = {Thomas M. Kehn},
  year = {1963},
  doi = {10.3133/gq252},
  url = {https://pubs.usgs.gov/publication/gq252},
  note = {Source identifier: gq252}
}