Changes to 83/511/EEC: Commission Decision of 7 October 1983 amending for the first time Decision 83/453/EEC concerning certain measures of protection against classical swine fever
EU Decision 1983/511
No changes to 83/511/EEC: Commission Decision of 7 October 1983 amending for the first time Decision 83/453/EEC concerning certain measures of protection against classical swine fever are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.