If the book is out of copyright, or the publisher has given Google books permission, you'll be able to see a preview of the book, and in some cases the entire text.
More than 6,000 Open Access ebooks from 75+ publishers, including Brill, Cornell University Press, De Gruyter, and University of California Press, are now available at no cost to libraries or users.
6,300 ebook titles available on DPLA’s Open Bookshelf. Choose from classic novels, children’s books, textbooks and non-English titles, all for free, with no login or library card needed.