@misc{indiciaedf0bbc1f4070,
  title = {Potentiometric surface of the Upper Floridan aquifer in the St. John's Water Management District and vicinity, Florida, September 1993},
  author = {R. M. Spechler and G. G. Phelps and L. A. Bradner and L. C. Murray and K. J. Halford},
  year = {1993},
  doi = {10.3133/ofr9433},
  url = {https://pubs.usgs.gov/publication/ofr9433},
  note = {Source identifier: ofr9433}
}