142. Third International Mathematics and Science Study: International Curriculum Analysis, 1992-1995 (TIMSS) Bookmark Format Series - ongoing
143. Transition to agriculture and first state presence: A global analysis Bookmark Format Single study
144. Transnational Social Movement Organization Dataset, 1953-2003 Bookmark Format Series - completed
148. United Nations Surveys of Crime Trends and Operations of Criminal Justice Systems (1970+) Bookmark Format Series - ongoing