Changes made by 64/503/EEC: Commission Decision of 30 July 1964 on the institution of a special method of administrative co-operation for applying intra-Community treatment to the fishery catches of vessels of Member States
EU Decision 1964/503
No changes made by 64/503/EEC: Commission Decision of 30 July 1964 on the institution of a special method of administrative co-operation for applying intra-Community treatment to the fishery catches of vessels of Member States are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.