@misc{indiciae6ce70d70bb1d,
  title = {Geologic map of the Dingus Quadrangle, eastern Kentucky},
  author = {William F. Outerbridge},
  year = {1975},
  doi = {10.3133/ofr75168},
  url = {https://pubs.usgs.gov/publication/ofr75168},
  note = {Source identifier: ofr75168}
}