R Gruppe – The Book About America's Cult Porsche Car Club, Frank KayserA wonderful illustrated book about the cult of Porsche. This book takes you on a journey through the history of the american automobile club R Gruppe. 840 brilliant images of awesome cars, candid visits of members private garages, and beautiful Californian landscapes will immerse you completely into the world of Porsche. The German photographer Frank Kayser has researched over months and bound the results in this amazing book. coffee table book 26. 5