Changes to 91/591/EEC: Commission Decision of 5 November 1991 amending Commission Decision 90/613/EEC approving derogations provided for by Italy from certain provisions of Council Directive 77/93/EEC in respect of seed potatoes originating in Poland (Only the Italian text is authentic)
EU Decision 1991/591
No changes to 91/591/EEC: Commission Decision of 5 November 1991 amending Commission Decision 90/613/EEC approving derogations provided for by Italy from certain provisions of Council Directive 77/93/EEC in respect of seed potatoes originating in Poland (Only the Italian text is authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.