A better alternative would be the software program Google Books Downloader which can be used to download parts or entire books in pdf format. The process requires some manual work on part of the user. Books and magazines are identified by an unique ID which is displayed in the address bar. That unique ID has to be copied and pasted into the software. Everything else is done automatically by the software. The program will scan all pages of the selected book or magazine and display all pages in its interface.

Each page can be selected for download separately which is useful if only selected parts of the book or magazine should be downloaded. The other option available is to download the full book or magazine right away to the local computer.

google books download

Only the scanned magazine or book pages are downloaded and included in the pdf document. The size of the pdf document depends on the number of pages of the book or magazine. Google Books Downloader provides an excellent way of downloading books and magazines from Google easily.

Update: The program appears to be no longer available. You can check out some of the alternatives that are still working. First the userscript Google Book Downloader and then How To Download Google Books Ebooks.