TA Engineering (General). Civil engineering (General) 21 TJ Mechanical engineering and machinery 15 TK Electrical engineering. Electronics Nuclear engineering 15 TP Chemical technology 9 TH Building construction 8 QA75 Electronic computers. Computer science 7 G70.212-70.215 Geographic information system 6 HD Industries. Land use. Labor 5 HD28 Management. Industrial Management 4 QA76 Computer software 4 TS Manufactures 3 HD1394-1394.5 Real estate management 2 HD30.213 Management information systems. Decision support systems 2 HE Transportation and Communications 2 QA Mathematics 2 T Technology (General) 2 HD61 Risk Management 1 HG Finance 1 NA Architecture 1 QD Chemistry 1 QE Geology 1 Unspecified 1 VM Naval architecture. Shipbuilding. Marine engineering 1 ZA4050 Electronic information resources 1