Texas Commission on Environmental Quality. Field Operations Support Division. Rules Protecting the Edwards Aquifer Recharge, Contributing, and Transition Zones, pamphlet, April 2008; (https://texashistory.unt.edu/ark:/67531/metapth624126/m1/1/: accessed April 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .