While this extraordinary project may be the largest assemblage of books online, there are other similar projects worldwide. See below.
When to Use Google Books: Google Books should not be your first stop. We have many stronger resources to identify books, including WorldCat local. A strength of Google Books is that you can search the full text across so many books. However, the number of returns can be a weakness. Unique phrases and words are more successfully searched in Google books. Google Books is also useful for previewing books, especially for reviewing the table of contents.