1. Potentiometric surface of the upper Floridan aquifer system in the Northwest Florida Water Management District, Florida [microform] Yale Public content 1900. 2002-06-01T04:00:00Z. 2002-06-01T04:00:00Z. Geological Survey (U.S.). The Survey : Books and Open-File Reports [Section, distributor. English. Public. Northwest Florida Water Management District (Fla.) and Florida.