@misc{indiciaead72ce5583ef,
  title = {Geologic map of the Tiptop quadrangle, eastern Kentucky},
  author = {Walter Danilchik},
  year = {1977},
  doi = {10.3133/gq1410},
  url = {https://pubs.usgs.gov/publication/gq1410},
  note = {Source identifier: gq1410}
}