TA Engineering (General). Civil engineering (General) 47 QA75 Electronic computers. Computer science 34 TK Electrical engineering. Electronics Nuclear engineering 31 HD28 Management. Industrial Management 30 TJ Mechanical engineering and machinery 27 TH Building construction 15 QA76 Computer software 13 HD Industries. Land use. Labor 10 T Technology (General) 10 HD1394-1394.5 Real estate management 8 QA Mathematics 8 HF Commerce 7 L Education (General) 7 HD61 Risk Management 5 TP Chemical technology 5 G70.212-70.215 Geographic information system 4 HE Transportation and Communications 4 HF5549.5.M63 Employee motivation 4 HT101-395 Sociology, Urban 4 LB Theory and practice of education 4 NA Architecture 4 QE Geology 4 TH434-437 Quantity surveying 4 G Geography (General) 3 HB Economic Theory 3 TC Hydraulic engineering. Ocean engineering 3 TE Highway engineering. Roads and pavements 3 G154.9-155.8 Travel and state. Tourism 2 G70.39-70.6 Remote sensing 2 GE Environmental Sciences 2