*Internet Archives
Link:  http://www.archive.org/index.php   

*The Library of Congress - Digital Collections
Link:  http://www.loc.gov/library/libarch-digital.html

*Open Library
  Link:  http://openlibrary.org/

*Family History Archives - Brigham Young Library
Link:   http://www.lib.byu.edu/fhc/index.php

*Google Books
Link:   http://books.google.com/