This volume contains a series of cumulative indexes and tables covering volumes XI--XX of the Yearbook: cases, bilateral and multilateral agreements, municipal legislation, authors, an index of names and a subject index.
As such, it builds upon and complements the cumulative index to Volumes I--X which was published in 1983. This cumulative index provides the reader with easy access to a wealth of information contained in the volumes published during the second decade of the Yearbook 's existence.