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Region
- Arkansas51
- Mississippi River Valley8
- Sparta Aquifer (Ark. and La.)6
- Louisiana4
- Memphis Aquifer3
- Wilcox Group3
- ArkansasBeaver Lake2
- Illinois River (Ark. and Okla.)2
- ArkansasHot Springs Region1
- ArkansasLittle Red River1
- ArkansasSiloam Springs Region1
- ArkansasUnion County1
- Boeuf River Watershed (Ark. and La.)1
- Mississippi River Watershed1
- Ozark Aquifer (Ark.)1
- Tokio Formation (Ark. and Okla.)1