Changes made by Council Regulation (EEC) No 3587/91 of 3 December 1991 extending into 1992 the application of Regulations (EEC) No 3831/90, (EEC) No 3832/90, (EEC) No 3833/90 and (EEC) No 3835/90 applying generalized tariff preferences for 1991 in respect of certain products originating in developing countries: Council Regulation (EEC) No 3835/90 of 20 December 1990 amending Regulations (EEC) No 3831/90, (EEC) No 3832/90 and (EEC) No 3833/90 in respect of the system of generalized tariff preferences applied to certain products originating in Bolivia, Colombia, Ecuador and Peru