Council Regulation (EEC) No 1029/81 of 9 April 1981 amending Regulations (EEC) No 1767/77, (EEC) No 828/78 and (EEC) No 938/79 and Regulations (EEC) No 1769/77 and (EEC) No 831/78 on the supply of skimmed-milk powder and milk fats, respectively, to certain developing countries and specialized bodies under the annual food-aid programmes