@misc{indiciae0b026b8daca1,
  title = {Geologic map of the Barcreek Quadrangle, Clay County, Kentucky},
  author = {Alfred R. Taylor},
  year = {1977},
  doi = {10.3133/ofr77679},
  url = {https://pubs.usgs.gov/publication/ofr77679},
  note = {Source identifier: ofr77679}
}