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 worlds 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 photographs 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 Americas 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 & Maintenance Manuals in this history, which also includes never-seen-before photographs and colour profiles. This volume is a must for the aviation historian, enthusiast, and modeller.