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12. Altitude of the potentiometric surface and changes in water levels in the Sparta-Memphis aquifer in eastern and southern Arkansas, spring 1986
13. Altitude of the potentiometric surface in the Manchester Aquifer at Arnold Air Force Base, May 1991, Coffee and Franklin counties, Tennessee
14. Altitude of the potentiometric surface, September 1990, and historic water-level changes in the Memphis aquifer in the Memphis area, Tennessee
15. Altitude of the potentiometric surfaces, September 1995, and historical water-level changes in the Memphis and Fort Pillow aquifers in the Memphis area, Tennessee
16. Altitude of top of bedrock in the vicinity of Wright-Patterson Air Force Base, Ohio
17. Approximate location of the 10,000-milligram-per-liter dissolved-solids boundary in the Silurian and Devonian carbonate-rock aquifer, southwestern and northern Indiana
18. Approximate potentiometric surface for the aquifer unit A2, southeastern coastal plain aquifer system of the United States, prior to development
19. Approximate potentiometric surface for the aquifer unit A3, southeastern coastal plain aquifer system of the United States, prior to development
20. Approximate potentiometric surface for the aquifer unit A4, southeastern coastal plain aquifer system of the United States, prior to development
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