@misc{indiciaeb7a9b7f10224,
  title = {Regional geologic implications of the gravity and magnetic fields of a part of eastern Tennessee and southern Kentucky},
  author = {Joel S. Watkins},
  year = {1964},
  doi = {10.3133/pp516a},
  url = {https://pubs.usgs.gov/publication/pp516A},
  note = {Source identifier: pp516A}
}