"The mission of HathiTrust is to contribute to the common good by collecting, organizing, preserving, communicating, and sharing the record of human knowledge." from the Source: the HathiTrust
NOTE: As of today this coalition of at least 5 major universities has worked with Google to digitize more than 473 tereabytes of data. That includes a total in excess of 10 millions volumes with over 3 million volumes in the public domain. This should prove to be a valuable asset to scholars.