2017. 2017-03-21T18:00:07Z. 2017-04-20T12:48:12Z. Geological Survey (U.S.), cartographer, issuing body. U.S. Department of the Interior, U.S. Geological Survey. English. cartographic image. Public. Texas, Bexar County, Comal County, Trinity Aquifer (Tex.), Edwards Aquifer (Tex.), Bexar County., Comal County., Edwards Aquifer., and Trinity Aquifer.