Reveals the contents of over 1,000 digital repositories containing 20 million items. These resources, often hidden from search engine users behind web scripts, are known as the "deep web." The owners of these resources share them with the world using Open Archives Initiative harvesting software. Note: most are open access, but there may be restrictions on some of the items.
OAIster's home page http://www.oaister.org/" for more information.