43. Polity V: Political Regime Characteristics and Transitions, 1800-2018 Bookmark Format Series - ongoing
44. Population Exposure Estimates in Proximity to Nuclear Power Plants, Locations (1956-2012) Bookmark Format Series - ongoing
47. Third International Mathematics and Science Study: International Curriculum Analysis, 1992-1995 (TIMSS) Bookmark Format Series - ongoing
51. United Nations Surveys of Crime Trends and Operations of Criminal Justice Systems (1970+) Bookmark Format Series - ongoing