. . . . "Development of aircraft engines : 2 studies of relations between government and business. Development of aviation fuels" . . . . . . . . . . . "Development of aircraft engines" . "Development of aircraft engines"@en . . . . . . . . . . "Development of Aircraft Engines/Development of Aviation Fuels : two Studies of Relations Between Government and Business" . . . . . . . . . . . . . . . . . "Development of aircraft engines ; Development of aviation fuels : two studies of relations between government and business" . . . . . "Development of aircraft engines ; [and] Development of aviation fuels : two studies of relations between government and business" . . . "Development of aircraft engines and fuels"@en . "Development of aircraft engines and fuels" . "Development of aviation fuels"@en . "Development of aviation fuels" . "Aviation fuels"@en . . "Development of aircraft engines Two studies of relations between government and business"@en . . . . . "Flyvningens udvikling" . . "Flugtriebwerk." . . "Avions Moteurs." . . "Udviklingshistorie (Motorer)" . . "Politique industrielle." . . "Flymotorens udvikling" . . "Flybrændstof" . . "Fuel Systems" . . "Politik." . . "Naphta." . . . . "Flymotorer" . .