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Region
- Arkansas52
- ArkansasJohnson County5
- Mississippi River Valley5
- Missouri5
- ArkansasLogan County4
- Wilcox Group4
- ArkansasHarrison Region3
- Memphis Aquifer3
- Middle West3
- Sparta Aquifer (Ark. and La.)3
- ArkansasSebastian County2
- Louisiana2
- Oklahoma2
- OklahomaLe Flore County2
- Ozark Mountains2
- Arkansas River Valley1
- ArkansasAshley County1
- ArkansasBradley County1
- ArkansasBrinkley1
- Kansas1