L Education (General) 145 QA75 Electronic computers. Computer science 114 TK Electrical engineering. Electronics Nuclear engineering 70 QA76 Computer software 40 LB Theory and practice of education 35 QA Mathematics 29 PE English 20 LB2300 Higher Education 16 TJ Mechanical engineering and machinery 16 H Social Sciences (General) 13 P Philology. Linguistics 13 BP Islam. Bahaism. Theosophy, etc 12 T Technology (General) 11 TA Engineering (General). Civil engineering (General) 11 HD28 Management. Industrial Management 9 Q Science (General) 9 Unspecified 8 LB1603 Secondary Education. High schools 7 PL Languages and literatures of Eastern Asia, Africa, Oceania 6 HD Industries. Land use. Labor 5 HE Transportation and Communications 5 HF Commerce 4 QC Physics 4 TK5015.888 Web sites 4 TK7885-7895 Computer engineer. Computer hardware 4 G154.9-155.8 Travel and state. Tourism 3 NA Architecture 3 P Language and Literature 3 TH Building construction 3 TP Chemical technology 3