@misc{indiciae3b8158aaca87,
  title = {Potentiometric surface map of the Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1977},
  author = {Charles P. Laughlin and Eugene C. Hayes},
  year = {1977},
  doi = {10.3133/ofr77629},
  url = {https://pubs.usgs.gov/publication/ofr77629},
  note = {Source identifier: ofr77629}
}