The "Directory of Historic Racing Cars" by Denis Jenkinson, also known as "Jenks," is a first edition guide focusing on Formula 1 motor sport history. This book, published in the 1980s in the United Kingdom, serves as a valuable resource for enthusiasts and collectors interested in classic racing cars. The included press letter adds an extra layer of historical significance to this iconic piece of sports memorabilia. Perfect for fans of motor sport and Formula 1, this guide offers a comprehensive look at the past of these legendary racing machines.