The HathiTrust, founded in 2008 , is made up of research libraries committed to the long term preservation of books and other text materials. Hathi is an offshoot of the Google Books project and most of the digitization of works in Hathi has been performed by academic research libraries.
HathiTrust Digital Library
Over 16 million volumes are included in the HathiTrust. Over 5 million of these volumes are in the public domain and available for download by persons affiliated with HathiTrust member libraries.. Volumes not available for download are still searchable.
To get started searching the HathiTrust go to https://www.hathitrust.org/. It is best practice to log in to Hathi with your netID and password before you get started.