TY - RPRT TI - Digital surfaces and thicknesses of selected hydrogeologic units of the Floridan aquifer system in Florida and parts of Georgia, Alabama, and South Carolina AU - Lester J. Williams AU - Joann F. Dixon PY - 2015 DO - 10.3133/ds926 UR - https://pubs.usgs.gov/publication/ds926 ID - ds926 ER -