"A year after its launch by 25 leading U.S. research libraries, HathiTrust Digital Library announces a service that will transform how researchers use the more than 1.6 billion pages (4.6 million volumes) in its collections. The breakthrough allows for full-text searching capabilities across the entire library. Researchers can now search public domain and in-copyright works by keyword or phrase. Based on open source Solr/Lucene technology, the service expands on an experimental search of public domain volumes introduced in November 2008. Full-text search will continue to be supported across the repository as it grows at a rate of hundreds of thousands of volumes every month"
http://www.hathitrust.org/news/hathitrust-full-text-search-release