@misc{indiciae1d7c30315a9a,
  title = {Geologic map of the Hindman 7 1/2-minute Quadrangle, Knott County, Kentucky},
  author = {Walter Danilchik},
  year = {1976},
  doi = {10.3133/ofr76253},
  url = {https://pubs.usgs.gov/publication/ofr76253},
  note = {Source identifier: ofr76253}
}