TA Engineering (General). Civil engineering (General) 64 HD28 Management. Industrial Management 52 TK Electrical engineering. Electronics Nuclear engineering 50 TP Chemical technology 45 QA75 Electronic computers. Computer science 40 TJ Mechanical engineering and machinery 28 L Education (General) 27 QA Mathematics 21 LB Theory and practice of education 20 NA Architecture 18 TH Building construction 16 QD Chemistry 15 T Technology (General) 15 HD Industries. Land use. Labor 12 QA76 Computer software 10 HD1394-1394.5 Real estate management 9 G70.212-70.215 Geographic information system 8 Q Science (General) 8 R Medicine (General) 8 TD Environmental technology. Sanitary engineering 8 TH434-437 Quantity surveying 8 HF Commerce 7 QC Physics 7 HD30.213 Management information systems. Decision support systems 6 HT101-395 Sociology, Urban 6 Unspecified 6 QH301 Biology 5 TK7885-7895 Computer engineer. Computer hardware 5 BP Islam. Bahaism. Theosophy, etc 4 G154.9-155.8 Travel and state. Tourism 4