(765 ILCS 225/4) (from Ch. 133, par. 104)
    Sec. 4. As established for use in the East Zone, the Illinois Coordinate System is named, the "Illinois Coordinate System, East Zone".
    As established for use in the West Zone, the Illinois Coordinate System is named, the "Illinois Coordinate System, West Zone".
(Source: P.A. 83-742.)