Changes to 77/801/EEC: Council Decision of 20 December 1977 amending Decision 71/66/EEC on the reform of the European Social Fund
EU Decision 1977/801
No changes to 77/801/EEC: Council Decision of 20 December 1977 amending Decision 71/66/EEC on the reform of the European Social Fund are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.