2. Potentiometric surface of the Cockfield aquifer in southeastern Arkansas and the Wilcox aquifers in southern and northeastern Arkansas, October 1996-July 1997 [1998]
- Green Library : US Federal Documents : I 19.42/4:98-4084
- Earth Sciences Library (Branner) : Stacks : 550.6 .U58O 98-4084
3. Potentiometric surfaces of aquifers in the Cockfield Formation in southeastern Arkansas and the Wilcox Group in southern and northeastern Arkansas, 2000 [2000]
- Green Library : US Federal Documents : I 19.42/4:00-4206
- Earth Sciences Library (Branner) : Stacks : 550.6 .U58O 00-4206
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