Changes to 79/833/EEC: Commission Decision of 7 September 1979 laying down, for the purposes of the survey on the structure of agricultural holdings for 1979/80, the Community outline of the schedule of tables, the standard code and the detailed rules for the transcription on to magnetic tape of the data contained in such tables
EU Decision 1979/833
Made by 80/722/EEC: Commission Decision of 13 June 1980 supplementing Decision 79/833/EEC laying down, for the purposes of the survey on the structure of agricultural holdings for 1979/80, the Community outline of a schedule of tables together with the standard code and rules for the transcription on to magnetic tape of the data contained in these tables
From legislation.gov.uk's record of changes, the official one: see it there.