TY - RPRT TI - Potentiometric surface of the upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, September 1984 AU - George R. Schiner AU - Eugene C. Hayes PY - 1984 DO - 10.3133/ofr84865 UR - https://pubs.usgs.gov/publication/ofr84865 ID - ofr84865 ER -