@misc{indiciae3dce9f263dea,
  title = {Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, September 1989},
  author = {R. T. Burtell},
  year = {1990},
  doi = {10.3133/ofr90188},
  url = {https://pubs.usgs.gov/publication/ofr90188},
  note = {Source identifier: ofr90188}
}