TJ Mechanical engineering and machinery 8 TA Engineering (General). Civil engineering (General) 7 QA Mathematics 4 TH Building construction 4 TP Chemical technology 4 TK Electrical engineering. Electronics Nuclear engineering 3 HD28 Management. Industrial Management 2 L Education (General) 2 QA75 Electronic computers. Computer science 2 QE Geology 2 G70.212-70.215 Geographic information system 1 H Social Sciences (General) 1 HB615-715 Entrepreneurship. Risk and uncertainty. Property 1 NA Architecture 1 T Technology (General) 1 TS Manufactures 1 VM Naval architecture. Shipbuilding. Marine engineering 1