HD28 Management. Industrial Management 65 TA Engineering (General). Civil engineering (General) 53 TK Electrical engineering. Electronics Nuclear engineering 48 QA75 Electronic computers. Computer science 41 TP Chemical technology 33 T Technology (General) 22 QA76 Computer software 18 TJ Mechanical engineering and machinery 16 QA Mathematics 15 H Social Sciences (General) 14 HD Industries. Land use. Labor 13 HD1394-1394.5 Real estate management 13 G70.212-70.215 Geographic information system 10 HF Commerce 10 TH Building construction 8 HE Transportation and Communications 6 NA Architecture 6 HD61 Risk Management 5 Q Science (General) 5 TD Environmental technology. Sanitary engineering 5 G Geography (General) 4 L Education (General) 4 TS Manufactures 4 Unspecified 4 HB Economic Theory 3 HD30.213 Management information systems. Decision support systems 3 HF5549.5.M63 Employee motivation 3 HG Finance 3 NA9000-9284 City planning 3 G154.9-155.8 Travel and state. Tourism 2