@misc{indiciaef97e8221633f,
  title = {Potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity, September 1991},
  author = {D. M. Sumner and G. G. Phelps and R. M. Spechler and L. A. Bradner and L. C. Murray},
  year = {1992},
  doi = {10.3133/ofr9268},
  url = {https://pubs.usgs.gov/publication/ofr9268},
  note = {Source identifier: ofr9268}
}