Indexes – Most useful to find a citation by subject matter or chronological date. These entries give you quick facts about each treaty such as signatories and date entered into force.
Treaties in Force (Bilateral) - Provides country listing of treaties bewteen the United States and another country.
Treaties in Force (Multilateral) - Provides subject orientation to those treaties for which the United States is a party.
Flare Index to Treaties (1856 to present)
Multilateral treaties: index and current status & 11th Supp. (1856 - 1994)
World Treaty Index (1900 – 2000)
Multilateral Treaty Calendar (1648-1995) - Organized chronologically but has a subject index. The Table of Contents for this book can be found on Google Books (use control+f to search by subject).