TK Electrical engineering. Electronics Nuclear engineering 63 TA Engineering (General). Civil engineering (General) 59 QA75 Electronic computers. Computer science 47 TJ Mechanical engineering and machinery 41 L Education (General) 22 HD28 Management. Industrial Management 19 TH Building construction 18 TP Chemical technology 18 LB Theory and practice of education 17 NA Architecture 17 QA76 Computer software 14 HT101-395 Sociology, Urban 10 T Technology (General) 10 HF Commerce 7 HE Transportation and Communications 6 T58.5-58.64 Information technology 6 H Social Sciences (General) 5 HT Communities. Classes. Races 5 QA Mathematics 5 QE Geology 5 G70.212-70.215 Geographic information system 4 HD Industries. Land use. Labor 4 LB2300 Higher Education 4 TH434-437 Quantity surveying 4 TK7885-7895 Computer engineer. Computer hardware 4 TS Manufactures 4 Unspecified 4 BP Islam. Bahaism. Theosophy, etc 3 HD1394-1394.5 Real estate management 3 HF5549.5.M63 Employee motivation 3