Changes made by 91/21/EEC: Commission Decision of 18 December 1990 amending Commission Decision 85/634/EEC authorizing certain Member States to provide for derogations from certain provisions of Council Directive 77/93/EEC in respect of oak wood originating in Canada or the United States of America (Only the Spanish, Danish, German, French, Italian and Dutch texts are authentic)
EU Decision 1991/21
The legislation 91/21/EEC: Commission Decision of 18 December 1990 amending Commission Decision 85/634/EEC authorizing certain Member States to provide for derogations from certain provisions of Council Directive 77/93/EEC in respect of oak wood originating in Canada or the United States of America (Only the Spanish, Danish, German, French, Italian and Dutch texts are authentic) changes, newest first. Choose one to see each change.
From legislation.gov.uk's record of changes, the official one: see it there.