This rare book by Jeffrey R. Zwart titled Porsche Rennsport is a must-have for any Porsche enthusiast. It features the autographs of the author and seven legendary Porsche drivers, making it a unique and valuable addition to any collection. The book covers the history and evolution of Porsche racing, as well as the behind-the-scenes stories of some of the greatest drivers and their iconic cars. Whether you are a collector or just a fan of Porsche, this book is sure to delight and educate.