Jancis Robinson's long waited book on grape vines is out and it is huge, covering 1400 grape varieties in 1300 pages.
DNA evidence has revolutionised grape identification and this book has original research and the latest information. I have been been enthralled with it, but its production is unfortunately not perfect.
However, it's a book all serious wine geeks will want and it's essential for those studying for wine and sommelier qualifications. Wine Grapes - Book Review