Ordered this book and delivery been delay almost a month - Contact the seller and was told that the book was order from Europe and it will take up to certain days to arrive.The delivery service is poor --I will avoid purchase materials from this seller. It appear to me that this seller is a broker and does not have the materials in stock. Book like this one --I could go direct to Dr. Murdock's website and will be ship within a week which I've done before.