AN ACT EXCLUDING FROM THE OPERATION OF PROCLAMATION NO. 1826, WHICH ESTABLISHED THE NATIONAL GOVERNMENT CENTER (NGC) SITE AT QUEZON CITY, CERTAIN POSITIONS OF LAND THEREIN AND DECLARING THE SAME OPEN FOR DISPOSITION UNDER THE PROVISIONS OF ACT NO. 3038 IN RELATION TO THE PROVISIONS OF PUBLIC LAND ACT, AS AMENDED, AND FOR OTHER PURPOSES