1. Potentiometric surface map of the Floridan aquifer in central Sumter County, Florida, May 1980 [cartographic material] Yale Public content 1980. 2002-06-01T04:00:00Z. 2022-12-22T04:01:21Z. Geological Survey (U.S.). The Survey. English. cartographic image. Public. Florida, Sumter County, and Sumter County (Fla.).