TA Engineering (General). Civil engineering (General) 40 L Education (General) 31 TH Building construction 19 HD28 Management. Industrial Management 16 LB Theory and practice of education 11 QA75 Electronic computers. Computer science 9 HD Industries. Land use. Labor 8 NA Architecture 8 T Technology (General) 7 H Social Sciences (General) 6 QE Geology 6 Unspecified 6 BP Islam. Bahaism. Theosophy, etc 5 TH434-437 Quantity surveying 5 HD1394-1394.5 Real estate management 4 QA76 Computer software 4 TD Environmental technology. Sanitary engineering 4 LB2300 Higher Education 3 TJ Mechanical engineering and machinery 3 G Geography (General) 2 G154.9-155.8 Travel and state. Tourism 2 G70.212-70.215 Geographic information system 2 GE Environmental Sciences 2 HD30.213 Management information systems. Decision support systems 2 HG Finance 2 LB1603 Secondary Education. High schools 2 LG Individual institutions (Asia. Africa) 2 Q Science (General) 2 TK Electrical engineering. Electronics Nuclear engineering 2 BV1460 Religious Education 1