QA75 Electronic computers. Computer science L Education (General) 4 QA76 Computer software 4 T Technology (General) 3 HE Transportation and Communications 2 Q Science (General) 2 T58.5-58.64 Information technology 2 TJ Mechanical engineering and machinery 2 TK Electrical engineering. Electronics Nuclear engineering 2 HD28 Management. Industrial Management 1 HQ The family. Marriage. Woman 1 LB1603 Secondary Education. High schools 1 LB2300 Higher Education 1 LC Special aspects of education 1 T58.6-58.62 Management information systems 1 V Naval Science (General) 1 VM Naval architecture. Shipbuilding. Marine engineering 1