Considering I have an extensive collection of books on this subject, this one is my favourite. It is well researched and documented. It is accurate in that Mr. Chirnside has made a great effort to clarify nearly all the misinformation that has been perpetuated over and over in other books on this subject as well as providing additional information, both technical and visual, not found in previous books. It is very readable and well thought out. Overall a fine effort and attractively priced considering the content. Highly recommended.