RT Book, Section SR Electronic(1) A1 United Nations YR 1987 T1 International Labour Organization (ILO) T2 Yearbook of the United Nations 1987 PB United Nations SN 9789210601757 DO 10.18356/e9eab0c9-en UL https://www.un-ilibrary.org/content/books/9789210601757s006-c002