Design and construction Automobiles 157 Airplanes 85 History 82 Integrated circuits 71 Data processing 56 Sustainable buildings 49 Motor vehicles 41 Bridges 37 Electronic apparatus and appliances 37 Environmental aspects 37 Planning 37 Maintenance and repair 31 Equipment and supplies 30 Health facilities 28 Printed circuits 28 Chemical plants 27 Very large scale integration 27 Computer-aided design 23 Materials 23 Roads 23 Safety measures 23 Buildings 22 Motors 22 Airports 21 Radio circuits 21 Dwellings 20 Management 20 Standards 20 Digital integrated circuits 19