TA Engineering (General). Civil engineering (General) 166 TP Chemical technology 134 TK Electrical engineering. Electronics Nuclear engineering 108 TJ Mechanical engineering and machinery 80 HD28 Management. Industrial Management 67 T Technology (General) 55 TH Building construction 43 QA75 Electronic computers. Computer science 38 HB Economic Theory 34 H Social Sciences (General) 33 NA Architecture 31 HD1394-1394.5 Real estate management 28 HT101-395 Sociology, Urban 26 HD Industries. Land use. Labor 25 QA Mathematics 20 G70.212-70.215 Geographic information system 18 HF Commerce 17 TD Environmental technology. Sanitary engineering 17 GE Environmental Sciences 15 HC Economic History and Conditions 13 QA76 Computer software 13 QD Chemistry 13 L Education (General) 12 Q Science (General) 12 BP Islam. Bahaism. Theosophy, etc 11 TH434-437 Quantity surveying 9 G154.9-155.8 Travel and state. Tourism 8 HG Finance 8 HT Communities. Classes. Races 8 HE Transportation and Communications 7