@misc{indiciae1afb8d1cf822,
  title = {Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1990},
  author = {R. M. Spechler and L. C. Murray and L. A. Bradner and G. G. Phelps},
  year = {1991},
  doi = {10.3133/ofr91190},
  url = {https://pubs.usgs.gov/publication/ofr91190},
  note = {Source identifier: ofr91190}
}