G154.9-155.8 Travel and state. Tourism 30 HD28 Management. Industrial Management 24 NA Architecture 11 G Geography (General) 10 QA75 Electronic computers. Computer science 10 TH Building construction 10 GV Recreation Leisure 9 HD Industries. Land use. Labor 9 H Social Sciences (General) 8 TH434-437 Quantity surveying 8 HT101-395 Sociology, Urban 7 GE Environmental Sciences 5 T Technology (General) 5 HD1394-1394.5 Real estate management 4 QA76 Computer software 4 TA Engineering (General). Civil engineering (General) 4 TK Electrical engineering. Electronics Nuclear engineering 4 Unspecified 4 HE Transportation and Communications 3 HF Commerce 3 TJ Mechanical engineering and machinery 3 HD30.213 Management information systems. Decision support systems 2 HT Communities. Classes. Races 2 QA Mathematics 2 QE Geology 2 TC Hydraulic engineering. Ocean engineering 2 TS Manufactures 2 GT Manners and customs 1 HF5601 Accounting 1 HN Social history and conditions. Social problems. Social reform 1