elsevier-pockets : 106 en 107 Winston Churchill als Kolonel Warden / Gerald Pawle ; voorw. van W. Averell Harriman ; uit het Eng. vert. door J. van Ginkel Military engineering / Army Council : Vol. VII: Accomodation and installations bbc engineering training manuals Microphones / by the staff of the BBC, Engineering Training Department British aircraft industry : a directory of Aircraft, Aero-Engines Component Parts, Accessories and Materials, 1939 / The Society of British Aircraft Constructors paper on high-speed tool steel, its manufacture and use / read before The Coventry Engineering Society by J.M. Gledhill