Dates of coverage vary. Unlimited users.
Updated daily. Searches complete text of books from selected library collections and publishers. Search works just like a regular Google search -- when book content contains a match for selected search terms, Google provides links to it in the search results. Depending on a few factors, Google displays everything from a few short excerpts to the entire book.
Each book includes an "About this book" page with basic bibliographic data like title, author, publication date, length and subject. For some books, additional information like key terms and phrases, references to the book from scholarly publications or other books, chapter titles and a list of related books.