@misc{indiciae7d123372cac7,
  title = {Geologic map of the Custer quadrangle, Breckinridge and Hardin Counties, Kentucky},
  author = {Dewey Harold Amos},
  year = {1977},
  doi = {10.3133/gq1367},
  url = {https://pubs.usgs.gov/publication/gq1367},
  note = {Source identifier: gq1367}
}