Proposed programme budget for the biennium 1976-1977 and medium-term plan for the period 1976-1979 : revised estimates under expenditure sections 1, 2, 3, 20, 21, 22, 25 and 26 and income sections 1 and 2 : 29th report of the Advisory Committee on Administrative and Budgetary Questions to the General Assembly at its 30th session