TH Building construction 9 TA Engineering (General). Civil engineering (General) 6 K Law (General) 5 NA Architecture 4 T Technology (General) 3 H Social Sciences (General) 2 HD Industries. Land use. Labor 2 HD28 Management. Industrial Management 2 LB2300 Higher Education 2 QE Geology 2 TJ Mechanical engineering and machinery 2 TK Electrical engineering. Electronics Nuclear engineering 2 G109.5 Global Positioning System 1 HD1394-1394.5 Real estate management 1 HG Finance 1 Q Science (General) 1 QA75 Electronic computers. Computer science 1 QA76 Computer software 1 RC Internal medicine 1 TD Environmental technology. Sanitary engineering 1 TG Bridge engineering 1 TS Manufactures 1