@misc{indiciae587ecfa525c7,
  title = {Geologic map of the Middlesboro North quadrangle, Bell County, Kentucky},
  author = {Charles L. Rice and Russell G. Ping},
  year = {1989},
  doi = {10.3133/gq1663},
  url = {https://pubs.usgs.gov/publication/gq1663},
  note = {Source identifier: gq1663}
}