TP Chemical technology 83 QD Chemistry 68 TK Electrical engineering. Electronics Nuclear engineering 60 TJ Mechanical engineering and machinery 59 TA Engineering (General). Civil engineering (General) 56 QC Physics 24 Q Science (General) 19 TD Environmental technology. Sanitary engineering 14 TS Manufactures 9 QH Natural history 5 T Technology (General) 5 Additive manufacturing 4 GE Environmental Sciences 4 Selective laser melting 4 3D printing 3 Characterisation 2 Direct impregnation method 2 Enviornmental Studies 2 Friction stir lap welding 2 Fucoidan 2 HD Industries. Land use. Labor 2 Metal 2 QA Mathematics 2 QA75 Electronic computers. Computer science 2 QH301 Biology 2 QP Physiology 2 R Medicine (General) 2 TC Hydraulic engineering. Ocean engineering 2 TK7885-7895 Computer engineer. Computer hardware 2 Trace metals 2