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 information contained in the volumes published during the second decade of the Yearbook's existence.