@misc{indiciaec0bed04fd67e,
  title = {Preliminary map showing faults in the Blackford Quadrangle, western Kentucky},
  author = {Dewey H. Amos},
  year = {1968},
  doi = {10.3133/ofr681},
  url = {https://pubs.usgs.gov/publication/ofr681},
  note = {Source identifier: ofr681}
}