Changes made by 79/371/EEC: Council Decision of 2 April 1979 amending the quotas for the importation into the Benelux countries of certain textile products originating in Albania and Hungary
EU Decision 1979/371
Made to 79/252/EEC: Council Decision of 21 December 1978 amending the unilateral import arrangements in respect of State-trading countries
From legislation.gov.uk's record of changes, the official one: see it there.