@misc{indiciae9cbb484e1309,
  title = {Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1991},
  author = {G. G. Phelps and R. M. Spechler and L. C. Murray and L. A. Bradner},
  year = {1992},
  doi = {10.3133/ofr91515},
  url = {https://pubs.usgs.gov/publication/ofr91515},
  note = {Source identifier: ofr91515}
}