G70.212-70.215 Geographic information system 136 TA Engineering (General). Civil engineering (General) 27 QA75 Electronic computers. Computer science 15 G Geography (General) 9 HD Industries. Land use. Labor 9 G70.39-70.6 Remote sensing 8 GE Environmental Sciences 6 NA Architecture 6 QA76 Computer software 6 GA Mathematical geography. Cartography 5 TH Building construction 5 H Social Sciences (General) 4 HD28 Management. Industrial Management 4 T Technology (General) 4 G Geography. Anthropology. Recreation 3 HD1394-1394.5 Real estate management 3 Q Science (General) 3 TK Electrical engineering. Electronics Nuclear engineering 3 HD61 Risk Management 2 HT101-395 Sociology, Urban 2 TP Chemical technology 2 GB Physical geography 1 HB Economic Theory 1 HD30.2 Knowledge management 1 HF Commerce 1 HJ Public Finance 1 HV Social pathology. Social and public welfare 1 NA9000-9284 City planning 1 QA Mathematics 1 QE Geology 1