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The SDR Database v.2.0 (SDR2) is a multi-country, multi-year database for research on political participation, social capital, and well-being. It comprises harmonized information from 23 international survey projects, covering over 4.4 million respondents from 156 countries in the period 1966 – 2017. SDR2 provides both target variables and methodological indicators that store source survey and ex-post harmonization metadata. SDR2 consists of three datasets. The MASTER file, which stores harmonized information for a total of 4,402,489 respondents. The auxiliary PLUG-SURVEY file containing controls for source data quality and a set of technical variables needed for merging this file with the MASTER file. And the PLUG-COUNTRY file, which is a dictionary of countries and territories used in the MASTER file. An overall description of the SDR2 Database, and detailed information about its datasets are available in the SDR2 documentation. SDR2 is a product of the project Survey Data Recycling: New Analytic Framework, Integrated Database, and Tools for Cross-national Social, Behavioral and Economic Research, financed by the US National Science Foundation (PTE Federal award 1738502). We thank the Ohio State University and the Institute of Philosophy and Sociology, Polish Academy of Sciences, for organizational support.