@misc{indiciae32006498d218,
  title = {Geologic map of the Grahn quadrangle, Carter County, Kentucky},
  author = {Kenneth John Englund},
  year = {1976},
  doi = {10.3133/gq1262},
  url = {https://pubs.usgs.gov/publication/gq1262},
  note = {Source identifier: gq1262}
}