@misc{indiciaedf50d9a4107d,
  title = {Preliminary geologic map of the Wheelwright quadrangle, southeastern Kentucky},
  author = {William F. Outerbridge},
  year = {1975},
  doi = {10.3133/ofr75257},
  url = {https://pubs.usgs.gov/publication/ofr75257},
  note = {Source identifier: ofr75257}
}