Changes to 77/498/EEC: Commission Decision of 20 July 1977 amending Decision 77/268/EEC on certain measures to prevent the spread of classical swine fever
EU Decision 1977/498
No changes to 77/498/EEC: Commission Decision of 20 July 1977 amending Decision 77/268/EEC on certain measures to prevent the spread of classical swine fever are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.