Design and construction Automobiles 148 Airplanes 86 History 84 Integrated circuits 71 Data processing 56 Sustainable buildings 49 Motor vehicles 41 Planning 39 Bridges 37 Environmental aspects 37 Electronic apparatus and appliances 36 Maintenance and repair 31 Equipment and supplies 30 Health facilities 29 Printed circuits 28 Chemical plants 27 Very large scale integration 27 Buildings 25 Computer-aided design 23 Materials 23 Hospitals 22 Motors 22 Safety measures 22 Airports 21 Dwellings 21 Management 21 Radio circuits 21 Standards 20 Digital integrated circuits 19