TY - RPRT TI - Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1997 AU - M. L. Merritt PY - 1998 DO - 10.3133/ofr98183 UR - https://pubs.usgs.gov/publication/ofr98183 ID - ofr98183 ER -