@misc{indiciae70ad3e842d3f,
  title = {Geologic map of the Big Creek quadrangle, southeastern Kentucky},
  author = {Richard Quintin Lewis and Dan E. Hansen},
  year = {1978},
  doi = {10.3133/gq1477},
  url = {https://pubs.usgs.gov/publication/gq1477},
  note = {Source identifier: gq1477}
}