L Education (General) 42 TK Electrical engineering. Electronics Nuclear engineering 15 QA75 Electronic computers. Computer science 13 LB Theory and practice of education 8 PE English 8 QA76 Computer software 7 HE Transportation and Communications 5 BP Islam. Bahaism. Theosophy, etc 3 T Technology (General) 3 H Social Sciences (General) 2 LB2300 Higher Education 2 P Language and Literature 2 P Philology. Linguistics 2 PL Languages and literatures of Eastern Asia, Africa, Oceania 2 Unspecified 2 BF Psychology 1 BV1460 Religious Education 1 HD28 Management. Industrial Management 1 HF Commerce 1 L Education 1 LB1603 Secondary Education. High schools 1 LG Individual institutions (Asia. Africa) 1 QA Mathematics 1 QC Physics 1 R Medicine 1 TJ Mechanical engineering and machinery 1 TK6570 Mobile Communication System 1 TK7885-7895 Computer engineer. Computer hardware 1 ZA4050 Electronic information resources 1