L Education (General) 87 QA75 Electronic computers. Computer science 34 QA Mathematics 17 LB2300 Higher Education 14 TK Electrical engineering. Electronics Nuclear engineering 14 H Social Sciences (General) 11 P Philology. Linguistics 11 PE English 9 LB Theory and practice of education 7 QA76 Computer software 7 T Technology (General) 7 PL Languages and literatures of Eastern Asia, Africa, Oceania 6 TJ Mechanical engineering and machinery 6 BP Islam. Bahaism. Theosophy, etc 5 TA Engineering (General). Civil engineering (General) 5 LB1603 Secondary Education. High schools 4 P Language and Literature 3 Q Science (General) 3 QC Physics 3 BV1460 Religious Education 2 G70.212-70.215 Geographic information system 2 HD28 Management. Industrial Management 2 HF Commerce 2 L Education 2 TH Building construction 2 G Geography (General) 1 H Social Sciences 1 HB Economic Theory 1 HD Industries. Land use. Labor 1 LB1501 Primary Education 1