In 1935, the intent of the Army Air Corps was to build a potential intercontinental bomber, a "Guardian of the Hemisphere"; they granted Donald Douglas a contract to build the world's largest bomber. Over the past 75 years, there have only been a few magazine articles on the gigantic Douglas XB-19 bomber, usually showing it in photos dwarfing the aircraft around it. Since the XB-19 project was top secret and there was only one example, there is little information remaining for researchers. William Wolf presents this enigmatic bomber, a "Flying Laboratory" that was the precursor to America's first intercontinental bomber, the Continental B-36 Peacemaker. Wolf has used original Douglas and Army Air Force documents and very rare (as few were needed for one bomber) Erection and Maintenance Manuals in this history, which also includes never-seen-before photos and colour profiles. This volume is a must for the aviation historian, enthusiast, and modeller.