TA Engineering (General). Civil engineering (General) T Technology (General) 20 Q Science (General) 15 TC Hydraulic engineering. Ocean engineering 10 TD Environmental technology. Sanitary engineering 6 TE Highway engineering. Roads and pavements 6 TP Chemical technology 6 QH301 Biology 5 GC Oceanography 4 L Education (General) 2 TJ Mechanical engineering and machinery 2 TK Electrical engineering. Electronics Nuclear engineering 2 GA Mathematical geography. Cartography 1 GB Physical geography 1 H Social Sciences (General) 1 HD Industries. Land use. Labor 1 HD28 Management. Industrial Management 1 QA Mathematics 1 QA76 Computer software 1 QC Physics 1 QD Chemistry 1 SB Plant culture 1 T58.5-58.64 Information technology 1 TH Building construction 1 V Naval Science (General) 1