The Yearbook contains documentary materials of a legal character concerning the United Nations and related intergovernmental organizations (IGOs). Pursuant to resolution 1814 (XVII) of 18 December 1962, the General Assembly requested the Secretary-General to publish a juridical yearbook which would include certain documentary materials of a legal character concerning the United Nations and related intergovernmental organizations as presented in an outline annexed to the resolution. The United Nations Juridical Yearbook has since been published on an annual basis reviewing legal developments starting from 1963. In 1972, the General Assembly further refined the publication's outline, which since then has been made up of three substantive parts, divided into eight chapters covering different legal themes together with a fourth part containing an extensive bibliography.