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Region
- Alabama2
- AlabamaMobile1
- Alamosa River (Colo.)1
- AlaskaGlacier Bay1
- AlaskaKoyukuk River Valley1
- American SamoaAunuu Island1
- American SamoaTutuila Island1
- Arizona9
- ArizonaMaricopa County2
- ArizonaPima County1
- ArizonaPinal County1
- ArizonaSalt River Indian Reservation1
- ArizonaSalt River Valley (Gila County and Maricopa County)2
- ArizonaTucson Aqueduct1
- Arkansas19