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