Congressional Index, 1938-Present
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Guide to the United States Treaties in Force
Kavass, Igor I. & Sprudzs, Adolf. Buffalo, New York.: W.S. Hein Co., 1982 (unofficial)
Treaties in Force: A List of Treaties and Other International Agreements of the United States
United States Department of State. Washington , D.C. : U.S. Gov’t Printing Office, 1929-Present (official).