TA Engineering (General). Civil engineering (General) 19 TJ Mechanical engineering and machinery 10 TH Building construction 8 TK Electrical engineering. Electronics Nuclear engineering 8 TP Chemical technology 6 G70.212-70.215 Geographic information system 5 HD Industries. Land use. Labor 5 QA75 Electronic computers. Computer science 5 HD28 Management. Industrial Management 4 QA76 Computer software 4 TS Manufactures 3 HD30.213 Management information systems. Decision support systems 2 HE Transportation and Communications 2 HD61 Risk Management 1 HG Finance 1 NA Architecture 1 QA Mathematics 1 QD Chemistry 1 QE Geology 1 T Technology (General) 1 Unspecified 1 VM Naval architecture. Shipbuilding. Marine engineering 1 ZA4050 Electronic information resources 1