QA75 Electronic computers. Computer science 13 TH Building construction 7 BP Islam. Bahaism. Theosophy, etc 5 NA Architecture 5 TK Electrical engineering. Electronics Nuclear engineering 5 LB Theory and practice of education 4 TA Engineering (General). Civil engineering (General) 4 HT101-395 Sociology, Urban 3 QA76 Computer software 3 TP Chemical technology 3 L Education (General) 2 BV1460 Religious Education 1 G70.212-70.215 Geographic information system 1 GV Recreation Leisure 1 HD1394-1394.5 Real estate management 1 HD28 Management. Industrial Management 1 HT Communities. Classes. Races 1 P Philology. Linguistics 1 QA Mathematics 1 QC Physics 1 QD Chemistry 1 T Technology (General) 1 TE Highway engineering. Roads and pavements 1 TJ Mechanical engineering and machinery 1