TA Engineering (General). Civil engineering (General) 45 QA75 Electronic computers. Computer science 34 QA76 Computer software 20 HD28 Management. Industrial Management 15 G70.212-70.215 Geographic information system 6 T Technology (General) 6 TK Electrical engineering. Electronics Nuclear engineering 5 HD Industries. Land use. Labor 4 NA Architecture 4 L Education (General) 3 TH Building construction 3 TJ Mechanical engineering and machinery 3 TK7885-7895 Computer engineer. Computer hardware 3 G70.39-70.6 Remote sensing 2 H Social Sciences (General) 2 HD1394-1394.5 Real estate management 2 HF Commerce 2 NA9000-9284 City planning 2 T58.5-58.64 Information technology 2 Unspecified 2 HD30.213 Management information systems. Decision support systems 1 HE Transportation and Communications 1 HG Finance 1 LB Theory and practice of education 1 LB1501 Primary Education 1 LB2300 Higher Education 1 QA Mathematics 1 QD Chemistry 1 QE Geology 1 R Medicine (General) 1