HD Industries. Land use. Labor K Law (General) 7 TA Engineering (General). Civil engineering (General) 7 TJ Mechanical engineering and machinery 6 HD28 Management. Industrial Management 5 QA76 Computer software 4 G Geography (General) 3 H Social Sciences (General) 3 QA75 Electronic computers. Computer science 3 TD Environmental technology. Sanitary engineering 3 TH Building construction 3 HB Economic Theory 2 HF Commerce 2 JS Local government Municipal government 2 GE Environmental Sciences 1 Geoinformation and Real Estate 1 HA Statistics 1 HD1394-1394.5 Real estate management 1 HD30.2 Knowledge management 1 HE Transportation and Communications 1 HT Communities. Classes. Races 1 NA Architecture 1 S Agriculture (General) 1 TC Hydraulic engineering. Ocean engineering 1 TH434-437 Quantity surveying 1 TR Photography 1 TS Manufactures 1 TT Handicrafts Arts and crafts 1