1. Ashworth , J.B. P. Christian T.C. Waterreus 1991 Evaluation of ground-water resources in the Southern High Plains of Texas TWDB
2. Ashworth , J.B. R.R. Flores 1991 Delineation criteria for the major and minor aquifer maps of Texas TWDB
3. Ashworth , J.B. J. Hopkins 1995 Aquifers of Texas TWDB
4. Perchlorate, an important constituent of sea water;Becking;Nature,1958