24. Measurement of Cross-cutting Cleavages and Other Multidimensional Cleavage Structures Bookmark Format Series - ongoing
26. Polity V: Political Regime Characteristics and Transitions, 1800-2018 Bookmark Format Series - ongoing
27. Population Exposure Estimates in Proximity to Nuclear Power Plants, Locations (1956-2012) Bookmark Format Series - ongoing
29. United Nations Surveys of Crime Trends and Operations of Criminal Justice Systems (1970+) Bookmark Format Series - ongoing