TJ Mechanical engineering and machinery 107 TK Electrical engineering. Electronics Nuclear engineering 82 TA Engineering (General). Civil engineering (General) 75 TP Chemical technology 68 L Education (General) 17 QD Chemistry 17 LB Theory and practice of education 14 QA75 Electronic computers. Computer science 14 T Technology (General) 8 TS Manufactures 8 Unspecified 8 QA Mathematics 7 QC Physics 7 Q Science (General) 5 Design 4 Experimental 4 TH Building construction 4 Textiles 4 Electromyography 3 Experimental design 3 HD28 Management. Industrial Management 3 Heuristics 3 Knitwear 3 Marketing 3 Mental health 3 Mindfulness 3 New Zealand 3 Performance 3 Retail 3 Simulation 3