This Harvard Think Tank Search is a custom Google search of more than 690 think tank websites.
Search 15 Think Tanks (U.S.) at the same time, via Google Custom Search.
- Canadian Public Documents Collection Collection of publications from Canadian public policy institutes, government agencies, advocacy groups, think-tanks, university research centres and other public interest groups.
- Conference Board of Canada e-Library
- NBER Working Paper Series
- Policy File Index Provides access to U.S. foreign and domestic policy papers and gray literature.
- Social Research and Demonstration Corporation (SRDC) A non-profit research organization, created specifically to develop, field test, and rigorously evaluate new programs.