@misc{indiciae52c70130a801,
  title = {Geologic map of the Tip Top Quadrangle, eastern Kentucky},
  author = {Walter Danilchik},
  year = {1976},
  doi = {10.3133/ofr76604},
  url = {https://pubs.usgs.gov/publication/ofr76604},
  note = {Source identifier: ofr76604}
}