Changes to 91/449/EEC: Commission Decision of 26 July 1991 laying down the specimen animal health certificates in respect of meat products imported from third countries
EU Decision 1991/449
Made by 92/244/EEC: Commission Decision of 8 April 1992 concerning the import of live pigs, fresh pigmeat and pigmeat products from Czechoslovakia and amending Decisions 82/425/EEC and 91/449/EEC
From legislation.gov.uk's record of changes, the official one: see it there.