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From Harvard's Kennedy School of Government library, this link is a custom Google search + list of hundreds of US and international think tanks affiliated with universities, governments, advocacy groups, foundations, non-governmental organizations, and businesses that generate public policy research, analysis, and activity.
Indexing for more than 8,800 serials, including full-text for more than 1,100 peer-reviewed business publications. The database also includes country economic reports, detailed company profiles, market research reports, industry reports, country reports, company profiles and SWOT analyses.