QA75 Electronic computers. Computer science 738 QA76 Computer software 21 TK Electrical engineering. Electronics Nuclear engineering 20 HD28 Management. Industrial Management 16 T58.5-58.64 Information technology 8 HE Transportation and Communications 6 HF Commerce 6 L Education (General) 6 QA Mathematics 5 LB2300 Higher Education 4 LC Special aspects of education 4 T Technology (General) 4 TA Engineering (General). Civil engineering (General) 3 TS Manufactures 3 ZA4050 Electronic information resources 3 G Geography (General) 2 GA Mathematical geography. Cartography 2 HD Industries. Land use. Labor 2 HG Finance 2 LB1603 Secondary Education. High schools 2 RC0254 Neoplasms. Tumors. Oncology (including Cancer) 2 RZ Other systems of medicine 2 TJ Mechanical engineering and machinery 2 Computer Science and Information System (Formerly known) 1 H Social Sciences (General) 1 HD61 Risk Management 1 HJ Public Finance 1 HQ The family. Marriage. Woman 1 HT Communities. Classes. Races 1 LB Theory and practice of education 1