Changes to Commission Decision of 30 March 1977 concerning certain measures to prevent the spread of classical swine fever
EU Decision 1977/268
Made by 77/293/EEC: Commission Decision of 18 April 1977 amending the Commission Decision of 30 March 1977 on certain measures to prevent the spread of classical swine fever
From legislation.gov.uk's record of changes, the official one: see it there.