TK Electrical engineering. Electronics Nuclear engineering 1,389 TA Engineering (General). Civil engineering (General) 1,358 TP Chemical technology 893 QA75 Electronic computers. Computer science 738 TJ Mechanical engineering and machinery 736 HD28 Management. Industrial Management 479 QA Mathematics 370 L Education (General) 300 QD Chemistry 293 TH Building construction 292 QC Physics 263 Q Science (General) 247 QA76 Computer software 233 LB Theory and practice of education 205 T Technology (General) 176 HD Industries. Land use. Labor 165 NA Architecture 141 Unspecified 135 HD1394-1394.5 Real estate management 124 TD Environmental technology. Sanitary engineering 112 G70.212-70.215 Geographic information system 104 HE Transportation and Communications 94 TS Manufactures 80 BP Islam. Bahaism. Theosophy, etc 66 QE Geology 62 R Medicine (General) 58 TE Highway engineering. Roads and pavements 57 HF Commerce 56 QH Natural history 56 HT101-395 Sociology, Urban 55