Well...Though there is nothing much silly about your idea Andrew I practically don;t understand the need for a book on Google.You see as said by others it is a matter of fact that Google is still a young company and still has much to prove.But still if they(Google) do so it would be great,but it is a thing that could only take place in a few decades.Anyway you could surf the net for serving your demand of knowing its history for the time being.