1. Geologic framework, structure, and hydrogeologic characteristics of the Knippa Gap area in eastern Uvalde and western Medina Counties, Texas Author/Creator: Clark, Allan K., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2013 Resource Type: Book Access & Availability: Loading
2. Geodatabase and characteristics of springs within and surrounding the Trinity Aquifer Outcrops in Northern Bexar County, Texas, 2010-11 Author/Creator: Clark, Allan K., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2013 Resource Type: Book Access & Availability: Loading
3. Geologic framework and hydrogeologic characteristics in the southern part of the Rancho Diana Natural Area, northern Bexar County, Texas, 2008-10 Author/Creator: Clark, Allan K., author Publication/Creation: Reston, Virginia : U.S. Department of the Interior, U.S. Geological Survey, 2011 Resource Type: Book Access & Availability: Loading
4. Vulnerability of ground water to contamination, Edwards aquifer recharge zone, Bexar County, Texas, 1998 Author/Creator: Clark, Allan K., author Publication/Creation: Austin, Texas : U.S. Deptartment of the Interior, U.S. Geological Survey, 2000 Resource Type: Book Access & Availability: Loading
5. Geologic framework of the Edwards aquifer and upper confining unit, and hydrogeologic characteristics of the Edwards Aquifer, south-central Uvalde County, Texas Author/Creator: Clark, Allan K., author Publication/Creation: Austin, Texas : U.S. Geological Survey, 1997 Resource Type: Book Access & Availability: Loading