Report 172 By, R. D. Reeves and T. A. Small, United States Geological Survey | June 1973, Reprinted April 1987
- Report 172 - Ground-Water Resources of Val Verde County, Texas (pdf - 7.26 mb)
Since May 23, 2025: Texas communities are being targeted in a phishing campaign with emails posing as TWDB. Click here for more information.