Commission Regulation (EEC) No 1680/91 of 17 June 1991 amending Regulation (EEC) No 3668/90 laying down implementing procedures for the import arrangements applicable to products covered by CN code 0714 10 91, 0714 10 99, 0714 90 11 and 0714 90 19 originating in the present Contracting Parties to the GATT other than Thailand