TY - RPRT TI - Potentiometric surface of the upper Floridan aquifer in the St. Johns River Water Management District and vicinity, Florida, September, 2002 AU - Sandra L. Kinnaman AU - Leel Knowles PY - 2003 DO - 10.3133/ofr03209 UR - https://pubs.usgs.gov/publication/ofr03209 ID - ofr03209 ER -