RT Book, Section SR Electronic(1) A1 United Nations Department of Economic and Social Affairs YR 1962 T1 Avant-propos T2 United Nations Demographic Yearbook 1961 PB United Nations SN 9789210581905 DO 10.18356/9ea691b8-fr UL https://www.un-ilibrary.org/content/books/9789210581905c003-fr