TY - RPRT TI - Potentiometric surface of the Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 1983 AU - G. R. Schiner AU - Eugene C. Hayes PY - 1983 DO - 10.3133/ofr83687 UR - https://pubs.usgs.gov/publication/ofr83687 ID - ofr83687 ER -