1. Delineation of the outcrop of the Edwards Aquifer hydrologically associated with Barton Springs in the Austin Area, Texas [cartographic material] Yale Public content 1985. 2002-06-01T04:00:00Z. 2023-10-11T03:01:27Z. Geological Survey (U.S.). The Survey : [Books and Open-File Reports Section, distributor]. English. cartographic image. Public. Texas, Austin Region, and Edwards Aquifer (Tex.).