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The World Treaty Index (WTI) is a comprehensive database of all known bilateral and multilateral treaties formed throughout the 20th century.

Originally Developed by Peter Rohn of the University of Washington-Seattle, I, along with my co-authors Daniel Katz (Michigan State University School of Law) and Michael Bommarito, have developed an updated and expanded version of the World Treaty Index (WTI).

The WTI is available at

You can also read our featured post on the Cornell Law School Legal Information Institute blog

NOTE: In January 2012, I, along with a team of research assistants, began coding treaties for the first 10 years of the twenty-first century. Updates will be added to the WTI as they become available.