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Think Tank Search
Think Tank Search is a custom Google search of more than 450 think tank websites selected by The Harvard Kennedy School of Government Library. See their website for information on the inclusion policy and links to U.S. and international think tank websites.
Evaluating Think Tanks
Wikipedia List of U.S. Think Tanks
Use to get an overview of the issues that a think tank is discussing and what social, policy or political biases that it brings to the discussion. Be sure to view the history page to determine if there are disputes about the information on the page.
OpenSecrets.org's Donor Look Up
Find the names of the think tank's board of directors on its website and then follow the money with this donor database.