@misc{indiciaef6ea7aaaea92,
  title = {Geologic map of the Pikeville quadrangle, Pike and Floyd Counties, Kentucky},
  author = {Donald Clayton Alvord and Charles E. Holbrook},
  year = {1965},
  doi = {10.3133/gq480},
  url = {https://pubs.usgs.gov/publication/gq480},
  note = {Source identifier: gq480}
}