content: In short, My kindle froze because of this book.When I first downloaded a sample of this book I couldn't turn to all of the pages but I liked what I had seen and thought the page turning issue was a problem with the sample format. I bought the full version. Big mistake. The book was slow to open and it took a long time to get to locations from the index. It froze temporarily weil I was turning to a page but I was able to get back to home. Something like two hours later when I tried to open the book again and an error showed up. I couldn't open it so I tried a different book that I can usually read. It also showed an error and wouldn't open. When I tried a third book the error apeared again and the screen froze. Now all I can do is put it to sleep and wake it up with the error screen.From the content I was able to see this book is seems to be a great resource. Just don't buy it for the kindle version.