1. Potentiometric surface map of the Floridan aquifer in central Sumter County, Florida, September 1980 [cartographic material] Yale Public content 1981. 2002-06-01T04:00:00Z. 2023-01-13T04:04:30Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Florida, Sumter County, Sumter County (Fla.), and Sumter County.