HD28 Management. Industrial Management 479 TA Engineering (General). Civil engineering (General) 139 HD Industries. Land use. Labor 63 TH Building construction 47 QA75 Electronic computers. Computer science 33 QA76 Computer software 25 TJ Mechanical engineering and machinery 25 TP Chemical technology 24 HD1394-1394.5 Real estate management 17 TK Electrical engineering. Electronics Nuclear engineering 15 TD Environmental technology. Sanitary engineering 13 T Technology (General) 11 HF Commerce 10 K Law (General) 9 HD61 Risk Management 8 HE Transportation and Communications 7 QA Mathematics 7 G70.212-70.215 Geographic information system 6 HD30.2 Knowledge management 5 TS Manufactures 5 Unspecified 5 HG Finance 4 G154.9-155.8 Travel and state. Tourism 3 H Social Sciences (General) 3 HD30.213 Management information systems. Decision support systems 3 NA Architecture 3 Q Science (General) 3 QE Geology 3 T58.5-58.64 Information technology 3 TH434-437 Quantity surveying 3