@misc{indiciae0a08e2e910fb,
  title = {Geologic map of the Willard Quadrangle, eastern Kentucky},
  author = {William Randall Brown},
  year = {1977},
  doi = {10.3133/ofr77520},
  url = {https://pubs.usgs.gov/publication/ofr77520},
  note = {Source identifier: ofr77520}
}