Sample surveys of current interest : United Nations Eleventh report / United Nations United Nations. Statistical Papers. Statistics - Papers 311.05 UNS Issued by the Statistical Office of the United Nations. Continues: Energy balances ... and electricity profiles ... for selected developing countries and areas. New York : United Nations, 1967. 1967. 1967 Text Collection 391 p. : Energy balances ... and electricity profiles ... for selected developing countries and areas