QA75 Electronic computers. Computer science 26 HD28 Management. Industrial Management 17 TA Engineering (General). Civil engineering (General) 15 HD Industries. Land use. Labor 13 L Education (General) 12 QA76 Computer software 11 H Social Sciences (General) 10 HD1394-1394.5 Real estate management 10 TH Building construction 10 T Technology (General) 9 G70.212-70.215 Geographic information system 7 NA Architecture 7 LB Theory and practice of education 6 BP Islam. Bahaism. Theosophy, etc 5 HT101-395 Sociology, Urban 5 LB2300 Higher Education 4 G Geography (General) 3 HF Commerce 3 K Law (General) 3 LB1603 Secondary Education. High schools 3 TJ Mechanical engineering and machinery 3 TK Electrical engineering. Electronics Nuclear engineering 3 Unspecified 3 LB1050.9-1091 Educational psychology 2 LC Special aspects of education 2 LG Individual institutions (Asia. Africa) 2 QD Chemistry 2 QE Geology 2 SB Plant culture 2 TK7885-7895 Computer engineer. Computer hardware 2