Changes to 81/518/EEC: Council Decision of 6 July 1981 on the restructuring of the system for agricultural surveys in Italy
EU Decision 1981/518
Made by 87/570/EEC: Council Decision of 7 December 1987 amending Decision 81/518/EEC on the restructuring of the system for agricultural surveys in Italy
From legislation.gov.uk's record of changes, the official one: see it there.