QC Physics 14 L Education (General) 11 TA Engineering (General). Civil engineering (General) 10 TK Electrical engineering. Electronics Nuclear engineering 9 TP Chemical technology 8 TH Building construction 7 TJ Mechanical engineering and machinery 6 HD1394-1394.5 Real estate management 5 HD28 Management. Industrial Management 4 NA Architecture 4 QE Geology 4 G70.212-70.215 Geographic information system 3 GE Environmental Sciences 3 HD Industries. Land use. Labor 3 HT101-395 Sociology, Urban 3 Q Science (General) 3 HT Communities. Classes. Races 2 QA Mathematics 2 TH434-437 Quantity surveying 2 BP Islam. Bahaism. Theosophy, etc 1 G Geography (General) 1 GA Mathematical geography. Cartography 1 GB Physical geography 1 H Social Sciences (General) 1 LB Theory and practice of education 1 LB1603 Secondary Education. High schools 1 NA9000-9284 City planning 1 QA75 Electronic computers. Computer science 1 QA76 Computer software 1 QD Chemistry 1