@misc{indiciaebead71051a09,
  title = {Potentiometric surface of the Tertiary limestone aquifer system, southeastern United States, May 1980},
  author = {Richard H. Johnston and Larry R. Hayes},
  year = {1981},
  doi = {10.3133/ofr81486},
  url = {https://pubs.usgs.gov/publication/ofr81486},
  note = {Source identifier: ofr81486}
}