Design and construction Automobiles 199 Integrated circuits 128 History 119 Airplanes 105 Bridges 80 Sustainable buildings 70 Data processing 62 Very large scale integration 53 Environmental aspects 50 Planning 50 Equipment and supplies 49 Motor vehicles 48 Electronic apparatus and appliances 47 Maintenance and repair 46 Semiconductors 39 Roads 37 Computer-aided design 36 Standards 36 Health facilities 35 Architecture 32 Buildings 32 Printed circuits 32 Safety measures 32 Design 30 Materials 30 Radio circuits 30 Testing 30 Chemical plants 29 Dwellings 29