Changes made by 80/917/EEC: Commission Decision of 9 July 1980 relating to a proceeding under Article 85 of the EEC Treaty (IV/27.958 National Sulphuric Acid Association) (Only the English text is authentic)
EU Decision 1980/917
No changes made by 80/917/EEC: Commission Decision of 9 July 1980 relating to a proceeding under Article 85 of the EEC Treaty (IV/27.958 National Sulphuric Acid Association) (Only the English text is authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.