TY - RPRT TI - Potentiometric surface of the Upper Floridan Aquifer in the St. Johns River Water Management District and vicinity, Florida, May 2009 AU - Sandra L. Kinnaman AU - Joann F. Dixon PY - 2009 DO - 10.3133/sim3091 UR - https://pubs.usgs.gov/publication/sim3091 ID - sim3091 ER -