TH Building construction 70 TK Electrical engineering. Electronics Nuclear engineering 62 K Law (General) 48 TA Engineering (General). Civil engineering (General) 35 BP Islam. Bahaism. Theosophy, etc 31 HD28 Management. Industrial Management 25 QA Mathematics 25 TJ Mechanical engineering and machinery 24 TP Chemical technology 20 HD Industries. Land use. Labor 19 T Technology (General) 17 HD1394-1394.5 Real estate management 15 QA75 Electronic computers. Computer science 15 QC Physics 11 TD Environmental technology. Sanitary engineering 10 TH434-437 Quantity surveying 10 NA Architecture 9 H Social Sciences (General) 8 Q Science (General) 8 QE Geology 8 Unspecified 7 G Geography (General) 6 L Education (General) 4 Q Science 4 G70.212-70.215 Geographic information system 3 HG Finance 3 TS Manufactures 3 GE Environmental Sciences 2 HB Economic Theory 2 HD30.213 Management information systems. Decision support systems 2