@misc{indiciae8dc09e3ff2ba,
  title = {Potentiometric surface map of the Floridan Aquifer in the St. Johns River water management district and vicinity, Florida, September 1978},
  author = {F. A. Watkins and C. P. Laughlin and E. C. Hayes},
  year = {1979},
  doi = {10.3133/ofr79986},
  url = {https://pubs.usgs.gov/publication/ofr79986},
  note = {Source identifier: ofr79986}
}