The Blue Max Airmen series is the real story of the German airmen awarded the Pour le MÃ©rite during the Great War. Author Lance J. Bronnenkant, PhD., and Aeronaut Books are pleased to bring you the most detailed and graphically lavish account of these heroes ever produced, covering the men in context with the warâs chronology of events. For each recipient a comprehensive, well-illustrated biography of the man is given, together with photos of the aircraft he flew, followed by details of his service, including other awards won. Color profiles of the aircraft are also provided for interest to enthusiasts and as references for modelers.Volume 13 covers three men, bomber commander Alfred Keller, leading naval ace Friedrich Christiansen, and fighter ace Heinrich Bongartz. Volume 13 includes 132 photographs and 8 color profiles of aircraft flown by these men in its 112 pages.