The Web sites for the think tanks which follow offer a wide variety of information -- some have the full text of many of their publications available for downloading. Columbia University Libraries also has many of their print publications. Search CLIO with the think tank as an author to locate them; for example, a=rand.
CIAO: Columbia International Affairs Online
Columbia International Affairs Online (CIAO) is designed to be the most comprehensive source for theory and research in international affairs. It publishes a wide range of scholarship from 1991 on that includes working papers from university research institutes, occasional papers series from NGOs, foundation-funded research projects, and proceedings from conferences.