I had purchased this book many years ago, but found time to open it just today. It stars with German V-weapons. I read on the 3rd page that the shells of the V-3 (Hochdruckpumpe) weighed 300 pounds. The figure seemed incorrect to me, because I knew of conventional naval gun shells which weighed more than ten times as much. (BL 18 inch Mk I naval gun). This gave me an urge to research about the book. So I checked the reviews here, and learned that errors are rampant in this book. I also searched the net and found that the author is not really an expert.So now the book is in my trashcan. It had been a waste of money, I didn't want it to be a waste of time as well.