James McGann at the University of Pennsylvania ranks public policy organizations each year. The report organizes ranking by the world and by region in addition to rankings by area of research.
A research firm focused on public well being in the areas of education, family support, health, and labor. Many of its reports are available for you to use on the company's web site.
Other companies providing research services to the United States government also make many of their reports available to the public. See Westat, MDRC, and RTI International as examples.
This organization makes conference papers searchable and provides full text access to many of them. SSRN collects conference papers, journal article pre-prints and working papers in the social sciences. This is a good place to find very recent material.
The Congressional Research Service prepares policy reports for Congress on all issues under consideration for legislation. These reports are not all released to the public. Individual legislators may post pertinent reports online. The link above allows you to search a site where many CRS report collections can be accessed full text.
This link allows you to search GAO reports, testimonies, and the full web site. As an investigative arm for Congress, GAO monitors compliance and accountability within government agencies, industry and business, and the public sector.
HeinOnline
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Provides searchable database of full text legal periodicals and primary documents. Subscribed libraries covering documents include: U.S. Congressional Documents, U.S. Federal Legislative History Library, U.S. Presidential Library, U.S. Statutes at Large, U.S. Supreme Court Library, and many others.
ProQuest Congressional
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Provides daily updated information on the U.S. legislature, including full text of bills starting in 1989, public laws starting in 1988, committee reports starting in 1990, House and Senate documents starting in 1995, Congressional Record starting in 1985, Federal Register starting in 1980, National Journal starting in 1977 and other government information.
State Documents
LexisNexis State Capital
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Tracks state bills, finds state statutes and regulations, and search state legislative reports and other policy-concerned media.