TY - RPRT TI - Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1997 AU - Nicasio Sepulveda PY - 1997 DO - 10.3133/ofr97572 UR - https://pubs.usgs.gov/publication/ofr97572 ID - ofr97572 ER -