Changes to Regulation No 146/67/EEC of the Council of 21 June 1967 laying down rules for calculating the levy and the sluice-gate price for poultrymeat
EU Regulation No 146/1967
Made by Regulation (EEC) No 1717/74 of the Council of 27 June 1974
From legislation.gov.uk's record of changes, the official one: see it there.