TJ Mechanical engineering and machinery 118 TK Electrical engineering. Electronics Nuclear engineering 110 TA Engineering (General). Civil engineering (General) 86 QA75 Electronic computers. Computer science 59 QA76 Computer software 24 TK7885-7895 Computer engineer. Computer hardware 12 QA Mathematics 6 T Technology (General) 6 Q Science (General) 5 TC Hydraulic engineering. Ocean engineering 5 TD Environmental technology. Sanitary engineering 5 TP Chemical technology 5 HD Industries. Land use. Labor 4 TL Motor vehicles. Aeronautics. Astronautics 4 TS Manufactures 4 VM Naval architecture. Shipbuilding. Marine engineering 4 Biomedical engineering 3 Computer engineering. Computer hardware 3 Engineering mathematics. Engineering analysis 3 Machine design and drawing 3 Mechanics applied to machinery. Dynamics 3 TG Bridge engineering 3 TN Mining engineering. Metallurgy 3 Computer applications to medicine. Medical informatics 2 Computers in education. Information technology 2 Engineering 2 Finite element method 2 G Geography (General) 2 H Social Sciences (General) 2 HE Transportation and Communications 2