QA75 Electronic computers. Computer science 85 TK Electrical engineering. Electronics Nuclear engineering 51 TA Engineering (General). Civil engineering (General) 38 QA76 Computer software 33 TH Building construction 14 TJ Mechanical engineering and machinery 14 HD28 Management. Industrial Management 12 G70.212-70.215 Geographic information system 11 T Technology (General) 11 QA Mathematics 9 TP Chemical technology 9 Q Science (General) 8 Unspecified 7 HF Commerce 6 Data mining 5 G Geography (General) 5 HE Transportation and Communications 5 QD Chemistry 5 HD1394-1394.5 Real estate management 4 NA Architecture 4 TK5015.888 Web sites 4 Cloud Computing 3 GA Mathematical geography. Cartography 3 New Zealand 3 QC Physics 3 QE Geology 3 QH301 Biology 3 TH434-437 Quantity surveying 3 TS Manufactures 3 Digital forensics 2