QA75 Electronic computers. Computer science 351 TK Electrical engineering. Electronics Nuclear engineering 295 TA Engineering (General). Civil engineering (General) 270 TJ Mechanical engineering and machinery 222 L Education (General) 221 TP Chemical technology 199 T Technology (General) 182 H Social Sciences (General) 103 HD28 Management. Industrial Management 102 Q Science (General) 86 QA Mathematics 71 QD Chemistry 46 LB Theory and practice of education 44 QC Physics 36 BP Islam. Bahaism. Theosophy, etc 34 QA76 Computer software 32 HD Industries. Land use. Labor 30 NA Architecture 30 HF Commerce 27 LB2300 Higher Education 27 TH Building construction 26 HD1394-1394.5 Real estate management 22 QH Natural history 17 G Geography (General) 14 LB1603 Secondary Education. High schools 14 HT101-395 Sociology, Urban 13 Q Science 13 HB Economic Theory 12 T58.5-58.64 Information technology 12 G70.212-70.215 Geographic information system 11