TY - RPRT TI - Potentiometric surface of the Upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1996 AU - G. G. Phelps AU - A. M. O’Reilly AU - L. A. Bradner AU - Leel Knowles PY - 1996 DO - 10.3133/ofr96589 UR - https://pubs.usgs.gov/publication/ofr96589 ID - ofr96589 ER -