TK Electrical engineering. Electronics Nuclear engineering 62 TA Engineering (General). Civil engineering (General) 48 QA75 Electronic computers. Computer science 45 TJ Mechanical engineering and machinery 34 TP Chemical technology 30 HD28 Management. Industrial Management 26 QA76 Computer software 18 QA Mathematics 17 T Technology (General) 10 L Education (General) 7 LB Theory and practice of education 7 TH Building construction 7 HE Transportation and Communications 6 HF Commerce 6 Unspecified 6 G70.212-70.215 Geographic information system 5 HD1394-1394.5 Real estate management 5 Q Science (General) 5 TL Motor vehicles. Aeronautics. Astronautics 5 HD Industries. Land use. Labor 4 HD61 Risk Management 4 HF5549.5.M63 Employee motivation 4 HT101-395 Sociology, Urban 4 NA Architecture 4 TK7885-7895 Computer engineer. Computer hardware 4 HB Economic Theory 3 HG Finance 3 QC Physics 3 TC Hydraulic engineering. Ocean engineering 3 G Geography (General) 2