T Technology (General) 37 TP Chemical technology 18 TJ Mechanical engineering and machinery 11 HD28 Management. Industrial Management 8 TK Electrical engineering. Electronics Nuclear engineering 7 TA Engineering (General). Civil engineering (General) 5 TS Manufactures 4 HD Industries. Land use. Labor 3 QA75 Electronic computers. Computer science 3 TD Environmental technology. Sanitary engineering 3 H Social Sciences (General) 2 Q Science (General) 2 QC Physics 2 T58.5-58.64 Information technology 2 G Geography (General) 1 HB Economic Theory 1 HF Commerce 1 HF5601 Accounting 1 HG Finance 1 QA76 Computer software 1 QK Botany 1 T Technology 1