TA Engineering (General). Civil engineering (General) 70 QA75 Electronic computers. Computer science 67 TJ Mechanical engineering and machinery 48 TH Building construction 46 TP Chemical technology 45 HD28 Management. Industrial Management 40 TK Electrical engineering. Electronics Nuclear engineering 39 T Technology (General) 22 NA Architecture 21 QA76 Computer software 21 L Education (General) 19 BP Islam. Bahaism. Theosophy, etc 15 H Social Sciences (General) 14 G70.212-70.215 Geographic information system 13 HD1394-1394.5 Real estate management 13 QD Chemistry 13 HD Industries. Land use. Labor 11 QA Mathematics 10 Q Science (General) 9 LB Theory and practice of education 8 TS Manufactures 8 TH434-437 Quantity surveying 7 K Law (General) 6 QE Geology 6 HE Transportation and Communications 5 HF Commerce 5 HB Economic Theory 4 HT101-395 Sociology, Urban 4 T58.5-58.64 Information technology 4 G154.9-155.8 Travel and state. Tourism 3