Changes made by 77/529/ECSC: Commission Decision of 29 July 1977 derogating from High Authority recommendation 1/64 concerning an increase in the protective duty on iron and steel products at the external frontiers of the Community (90th derogation)
EU Decision 1977/529
No changes made by 77/529/ECSC: Commission Decision of 29 July 1977 derogating from High Authority recommendation 1/64 concerning an increase in the protective duty on iron and steel products at the external frontiers of the Community (90th derogation) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.