TK Electrical engineering. Electronics Nuclear engineering 44 L Education (General) 29 TA Engineering (General). Civil engineering (General) 28 QA75 Electronic computers. Computer science 27 TJ Mechanical engineering and machinery 20 HD28 Management. Industrial Management 17 NA Architecture 17 LB Theory and practice of education 14 TH Building construction 14 H Social Sciences (General) 9 T Technology (General) 9 TP Chemical technology 9 QA Mathematics 6 HD1394-1394.5 Real estate management 5 LB2300 Higher Education 4 QD Chemistry 4 TD Environmental technology. Sanitary engineering 4 G70.212-70.215 Geographic information system 3 Q Science (General) 3 QA76 Computer software 3 QE Geology 3 TH434-437 Quantity surveying 3 TK7885-7895 Computer engineer. Computer hardware 3 BP Islam. Bahaism. Theosophy, etc 2 HD Industries. Land use. Labor 2 HF Commerce 2 HF5549.5.M63 Employee motivation 2 HT101-395 Sociology, Urban 2 PE English 2 Q Science 2