Before 1950, treaties were published in the United States Statutes at Large. Starting in 1945, the State Department has published international agreements of the United States in pamphlet form in a series known as the Treaties and Other International Acts Series(T.I.A.S.). After 1950, the State Department began publishing agreements that first appear in T.I.A.S. in a series of bound volumes called United States Treaties and other International Agreements. These materials are available in print at the Law Library of Congress and other research libraries, including most Federal Depository Libraries.
Electronically, treaties are available on a subscription database, HeinOnline, which is available on computer terminals within the Library of Congress and other research libraries.
Senate Treaty Documents, which contain the text of U.S. treaties sent by the President for ratification by the Senate, are available on Congress.gov beginning with the 94th Congress (1975-1976). Treaties can be searched from the Congress.gov homepage by selecting Treaty Documents option from the Current Legislation drop down box and searching by word or phrase. You can also search by Congress and treaty number by clicking on the More Options tab under the Search box and selecting Treaty Documents as the collection to be searched.
U.S. treaties from 1778 to 1875 are available on the Statutes at Large page of the Library of Congress’s Century of Lawmakingproject. Volume 7 of the Statutes at Large includes Indian treaties from 1778 to 1842. Volume 8 of the Statutes at Large includes foreign treaties from 1778 to 1845. Later treaties through 1875 are included in the subsequent individual volumes.
Access to treaties is also provided through the United States Treaty Series, which was compiled by Charles I. Bevans. This series includes treaties to which the United States was a party from 1776 to 1949. The series is broken down into 13 volumes: four volumes of multilateral treaties; eight volumes of bilateral treaties; and a one volume index.