TA Engineering (General). Civil engineering (General) 45 QA75 Electronic computers. Computer science 40 TH Building construction 39 TP Chemical technology 36 TK Electrical engineering. Electronics Nuclear engineering 30 HD28 Management. Industrial Management 29 TJ Mechanical engineering and machinery 29 NA Architecture 17 QA76 Computer software 16 BP Islam. Bahaism. Theosophy, etc 14 G70.212-70.215 Geographic information system 12 HD Industries. Land use. Labor 10 HD1394-1394.5 Real estate management 9 L Education (General) 8 QA Mathematics 8 QD Chemistry 8 TS Manufactures 8 T Technology (General) 7 K Law (General) 6 LB Theory and practice of education 6 QE Geology 6 TH434-437 Quantity surveying 6 HE Transportation and Communications 5 HF Commerce 4 Q Science (General) 4 H Social Sciences (General) 3 HT101-395 Sociology, Urban 3 T58.5-58.64 Information technology 3 Unspecified 3 G154.9-155.8 Travel and state. Tourism 2