This calendar, with illustrations, is a reference service focusing on multilateral treaties concluded by more than two parties. It covers a period of almost 350 years of multilateral diplomacy, from the Peace of Westphalia of 1648 to the end of 1995. It lists chronologically all multilateral treaties concluded during that period, provides information on the location of their printed text in various collections (with parallel citations), adds data on duration, depository arrangements, & status, & provides extensive notes on their amendment, modification, extension, termination, & other details (with related references). It ends with appendices & a detailed index.

A list of core group of multilateral treaties and a list of all multilateral treaties deposited with U.N. Secretary-General.