@misc{indiciae5d8a394e8965,
  title = {Geologic mapping of Kentucky: A history and evaluation of the Kentucky Geological Survey--U.S. Geological Survey Mapping Program, 1960-1978},
  author = {Earle Rupert Cressman and Martin C. Noger},
  year = {1981},
  doi = {10.3133/cir801},
  url = {https://pubs.usgs.gov/publication/cir801},
  note = {Source identifier: cir801}
}