TA Engineering (General). Civil engineering (General) 41 TP Chemical technology 29 TD Environmental technology. Sanitary engineering 12 HD1394-1394.5 Real estate management 10 TK Electrical engineering. Electronics Nuclear engineering 9 HD28 Management. Industrial Management 8 TH Building construction 7 H Social Sciences (General) 5 QA75 Electronic computers. Computer science 5 T Technology (General) 5 TJ Mechanical engineering and machinery 5 GE Environmental Sciences 4 NA Architecture 4 Q Science (General) 4 HD Industries. Land use. Labor 3 QA Mathematics 3 Unspecified 3 HT101-395 Sociology, Urban 2 QD Chemistry 2 QH Natural history 2 G70.39-70.6 Remote sensing 1 HD30.2 Knowledge management 1 HF Commerce 1 HT Communities. Classes. Races 1 NA9000-9284 City planning 1 TH434-437 Quantity surveying 1