Google Books is a book marketing program, not an online library, and as such, a full page of a book won't be viewable online unless expressly permitted by the copyright holder. Until then, people who find a copyrighted book will see, at most, basic bibliographic information about the book plus a few snippets — sentences of their search term in context.
If the copyright holder has given us permission to show more, users can see a Limited Preview which allows them to browse a limited number of pages from the book. The book may also be available as a Google eBook, in which case access to the full content can be purchased.
Google Books is aimed to help our users discover books, not necessarily read them online. In addition, the copy, save and print functions are disabled.
And, if you're the copyright holder, you can remove any of your books from Google Books at any time. See "What if I find one of my books in Google Books and would like it removed?"