Deprecated datum 6254, geogCRS 4254, projCRS 26432, tfm 1328-29. Added areas 3179-80, datums 6703-05, geogCRSs 4703-05, projCRSs 3353-54, tfms 15790-91 and 8656. For datum 6259 and CRSs 4259 and 25932 and tfm 1557 (Malongo 1987), added alias Mhast; changed area of use code from 1317 to 3180; amended coordinates of origin, scope and remarks.