@misc{indiciaed98f494b67ed,
  title = {Geologic map of the Williamsburg quadrangle, Whitley County, Kentucky},
  author = {R. W. Tabor},
  year = {1967},
  doi = {10.3133/gq616},
  url = {https://pubs.usgs.gov/publication/gq616},
  note = {Source identifier: gq616}
}