field manual Barrage balloon : operation of matériel and employment of personnel field manual Watermanship field manual 81-MM mortar squad and platoon field manual 75-mm tank gun M 2 : (mounted in medium tank M 3) Falling through space / R. Hillary Nationaal luchtvaartlaboratorium Amsterdam : rapport V.1361 : algemeene opmerkingen over de besturing en de stabiliteit van rotorvliegtuigen / L.L.Th. Huls International marine radio company : (I.M.R.C.) : war story Miracles of invention and discovery : what modern life owes to progress in science and engineering : the story of invention and discovery vividly described … Mental tests / Ph.B. Ballard rapport Drawing sphere for analysis of flight test results / S. Wijnia, L.R. Lucassen Boekbeoordeling / L.M. Rollin Couquerque Desertie / G.J.W. Koolemans Beijnen