TK Electrical engineering. Electronics Nuclear engineering 23 QA75 Electronic computers. Computer science 12 TA Engineering (General). Civil engineering (General) 10 L Education (General) 7 TP Chemical technology 6 HD28 Management. Industrial Management 5 NA Architecture 5 TJ Mechanical engineering and machinery 5 HD Industries. Land use. Labor 4 QA76 Computer software 4 TH Building construction 4 Unspecified 4 BP Islam. Bahaism. Theosophy, etc 3 LB Theory and practice of education 3 Q Science (General) 3 TD Environmental technology. Sanitary engineering 3 LB1603 Secondary Education. High schools 2 PE English 2 QA Mathematics 2 QC Physics 2 QH Natural history 2 TK7885-7895 Computer engineer. Computer hardware 2 G70.212-70.215 Geographic information system 1 HD61 Risk Management 1 HE Transportation and Communications 1 HM Sociology 1 HT Communities. Classes. Races 1 HT101-395 Sociology, Urban 1 K Law (General) 1 QD Chemistry 1