Beitrage zur Geschichte der Deutschen Luftfahrtwissenschaft und Technik, Luftwaffe technical manual volume 1, German text, numerous photographic plates of technical development, of wind tunnel experiments, glider development, rocket propulsion and aircraft pressurisation, copy number 55 of 1001, Berlin 1941; Karlson., Dr Paul: Der Mensch Fliegt, with forward Ernst Udet, Berlin 1937 and Udelt Leonard Der Herr der Luft, with eight plates, German gothic text, orig. illustrated front cover, title page with library stamps for the Kaiserlicher Aeroclub, Berlin 1914 and Reichsluftfahrtministerium (3)