How to Download Books from Google Book Store:-

First of all install Greasemonkey Add-On to your Firefox browser.
Click on Add to Firefox and then on install Now button.

Now Restart your Firefox and you will see a monkey icon adjacent to your Address bar.
After installing this you have to install a user script Google Book Downloader.
For this click on the install button and again on install button.

Now you will see a message displaying Google Book Downloader installed successfully at the right bottom of your screen.

Now go to the Google book store and find your book there.

Here you will see a button saying Download this Book in the left panel

That’s it. Now you will be able read your desired book offline.

Note:- If you are not able to download book on clicking Download this Book button then install FlashGot Add-on in your browser. After installing the addon right click on the Download this Book button and select FlashGot Link option and then click start download button.