@misc{indiciaebd2b5177bddf,
  title = {Geologic map of the Middlesboro North Quadrangle, Bell County, Kentucky},
  author = {Charles L. Rice and Russell G. Ping},
  year = {1987},
  doi = {10.3133/ofr87413},
  url = {https://pubs.usgs.gov/publication/ofr87413},
  note = {Source identifier: ofr87413}
}