@misc{indiciae85ebcf39f2b7,
  title = {Bedrock geologic map of Kentucky River Area Development District and vicinity, eastern Kentucky},
  author = {Wayne L. Newell and C. L. Rice},
  year = {1977},
  doi = {10.3133/mf865a},
  url = {https://pubs.usgs.gov/publication/mf865A},
  note = {Source identifier: mf865A}
}