This work was given to me as a retirement present some six years ago. I already had quite a collection of Porsche books covering company history, model history and development but this is the only work which, in my opinion covers the total minutae of the 911 series and their development. It appears to mis nothing Whether you are an owner, a prospective owner or merely and admirer, you cannot afford NOT to have this volume on your bookshelf. For the Porsche enthusiast, this is a must and a "steal" at the price.