Details of "over 2,000 of the most significant multilateral treaties concluded from 1353 onwards and a number of significant bilateral treaties signed between 1353 and 1815." Has links to online text (where available) and citations to print versions. [Free; no access restrictions.]
This site has an extensive collection of multilateral treaties but suffers from a cumbersome search engine. Includes the United Nations Treaty Series (UNTS) and the League of Nations Treaty Series (LNTS). [Free; no access restrictions.]
Includes the United Nations Treaty Series, the League of Nations Treaty Series, and supporting materials. [For current USF students, faculty, and staff.]
Chapter 4 of International Legal Research in a Nutshell (2017), by Marci B. Hoffman & Robert C. Berring. In print, at KZ 1234 .H64 2017 Law Open Reserve.