G154.9-155.8 Travel and state. Tourism 34 HD28 Management. Industrial Management 34 NA Architecture 16 H Social Sciences (General) 15 HD Industries. Land use. Labor 15 QA75 Electronic computers. Computer science 13 TH Building construction 13 G Geography (General) 12 GV Recreation Leisure 9 TH434-437 Quantity surveying 9 TA Engineering (General). Civil engineering (General) 8 HT101-395 Sociology, Urban 7 GE Environmental Sciences 6 HF Commerce 6 T Technology (General) 6 TK Electrical engineering. Electronics Nuclear engineering 6 HD1394-1394.5 Real estate management 5 QA Mathematics 4 QA76 Computer software 4 Unspecified 4 HE Transportation and Communications 3 NA9000-9284 City planning 3 TJ Mechanical engineering and machinery 3 TP Chemical technology 3 HD30.213 Management information systems. Decision support systems 2 HT Communities. Classes. Races 2 QD Chemistry 2 QE Geology 2 TC Hydraulic engineering. Ocean engineering 2 TS Manufactures 2