Communication systems Business 8 Data processing 7 Information technology 7 Railroads 5 Astronautics 4 Data transmission systems 4 Libraries 4 Telecommunication systems 4 Aeronautics 3 Automation 3 Congresses 3 Distance education 3 Interlibrary loans 3 International business enterprises 3 Management 3 Accounting 2 Armed Forces 2 Auditing 2 Communication in management 2 Computer networks 2 Construction industry 2 Electronic data interchange 2 Electronic mail systems 2 Electronic traffic controls 2 Evaluation 2 Express highways 2 Government policy 2 Harbors 2 Information networks 2