This comprehensive reference book contains 208 pages of detailed information on Harley-Davidson Knucklehead UL models produced between 1936 and 1947. The book is a valuable resource for collectors and enthusiasts of vintage Harley-Davidson motorcycles. It covers a wide range of aspects, including technical specifications, parts identification, and historical context.

In addition to its practical use as a reference guide, the book also serves as a piece of Harley-Davidson history. Its vintage status only adds to its collectible value, making it a must-have for any serious Harley-Davidson enthusiast. Whether you're looking to restore a classic motorcycle or simply interested in learning more about the iconic brand, this book is an excellent resource.