A group of research libraries are collaborating to create a repository of their digital collections, including millions of books. These holdings will be archived and preserved in a single repository called the HathiTrust. Materials in the public domain will be available for reading online. HathiTrust was launched jointly by the 12-university consortium known as the Committee on Institutional Cooperation (CIC) and the 11 university libraries of the University of California system. HathiTrust provides libraries a means to archive and provide access to their digital content, whether scanned volumes, special collections or born-digital materials. HathiTrust contains more than 2 million volumes and approximately a billion pages, about 16 percent of which are in the public domain.