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53. Polity V: Political Regime Characteristics and Transitions, 1800-2018 Bookmark Format Series - ongoing
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65. Third International Mathematics and Science Study: International Curriculum Analysis, 1992-1995 (TIMSS) Bookmark Format Series - ongoing
66. Trends in International Mathematics and Science Study (TIMSS) (1995+) Bookmark Format Series - ongoing
70. United Nations Surveys of Crime Trends and Operations of Criminal Justice Systems (1970+) Bookmark Format Series - ongoing
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