TK Electrical engineering. Electronics Nuclear engineering 11 TJ Mechanical engineering and machinery 10 TA Engineering (General). Civil engineering (General) 6 TP Chemical technology 5 QA75 Electronic computers. Computer science 4 T Technology (General) 3 QA76 Computer software 2 TS Manufactures 2 Unspecified 2 G70.212-70.215 Geographic information system 1 GT Manners and customs 1 L Education (General) 1 LB Theory and practice of education 1 Q Science (General) 1 QA Mathematics 1 QD Chemistry 1 R Medicine (General) 1 RD Surgery 1 RK Dentistry 1 T58.5-58.64 Information technology 1 TC Hydraulic engineering. Ocean engineering 1 TH Building construction 1 TK7885-7895 Computer engineer. Computer hardware 1 TL Motor vehicles. Aeronautics. Astronautics 1 TN Mining engineering. Metallurgy 1 VM Naval architecture. Shipbuilding. Marine engineering 1