The world's largest bibliographic database presents bibliographic records for books, serials (journals), and all other formats. Use WorldCat to find materials not in University Libraries or Prospector.

Google has worked with many major universities such as Stanford, Princeton, the University of Michigan and Oxford University to scan their out-of-print and current books.

Features over 700,000 volumes of electronic books in the public domain.

Internet Archive is a non-profit library of millions of free books, movies, software, music, websites, and more. It was founded to build an Internet library, with the purpose of offering permanent access for researchers, historians, and scholars to historical collections that exist in digital format. Founded in 1996, the Internet Archive has an historical web collection (the Wayback Machine).