TA Engineering (General). Civil engineering (General) 41 TK Electrical engineering. Electronics Nuclear engineering 37 TJ Mechanical engineering and machinery 29 QA75 Electronic computers. Computer science 27 HD28 Management. Industrial Management 18 TH Building construction 17 LB Theory and practice of education 16 NA Architecture 15 TP Chemical technology 15 QA76 Computer software 12 L Education (General) 10 HT101-395 Sociology, Urban 7 HE Transportation and Communications 6 HF Commerce 6 T Technology (General) 6 HT Communities. Classes. Races 5 QE Geology 5 G70.212-70.215 Geographic information system 4 H Social Sciences (General) 4 QA Mathematics 4 TK7885-7895 Computer engineer. Computer hardware 4 TS Manufactures 4 Unspecified 4 BP Islam. Bahaism. Theosophy, etc 3 HD Industries. Land use. Labor 3 HF5549.5.M63 Employee motivation 3 T58.5-58.64 Information technology 3 LB2300 Higher Education 2 QD Chemistry 2 TE Highway engineering. Roads and pavements 2