201. Open Educational Resources and Mathematics Skills 2014-2015 [Chile] Bookmark Format Single study
202. Oxford Supertracker The Global Directory for COVID Policy Trackers and Surveys Bookmark Format Data archive or collection
206. Political Business Cycles in Open Economies in 28 Developing Countries From Latin America, Asia, and Africa, 1976-2002 Bookmark Format Macrodata source
210. Polity V: Political Regime Characteristics and Transitions, 1800-2018 Bookmark Format Series - ongoing