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Library of Congress Subject Areas (154)
- H Social Sciences (10)
  - HC Economic History and Conditions (2)
  - HE Transportation and Communications (6)
  - HM Sociology (2)
- J Political Science (2)
  - JZ International relations (2)
- K Law (9)
  - K Law (General) (7)
  - KZ Law of Nations (2)
- L Education (65)
  - L Education (General) (1)
  - LA History of education (5)
  - LB Theory and practice of education (39)
    - LB1501 Primary Education (26)
    - LB1603 Secondary Education. High schools (13)
  - LC Special aspects of education (20)
    - LC5201 Education extension. Adult education. Continuing education (20)
- N Fine Arts (1)
  - NA Architecture (1)
- Q Science (11)
  - QA Mathematics (2)
    - QA75 Electronic computers. Computer science (2)
  - QC Physics (1)
  - QD Chemistry (4)
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  - QH Natural history (2)
    - QH301 Biology (2)
- R Medicine (3)
  - RA Public aspects of medicine (1)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RS Pharmacy and materia medica (2)
- S Agriculture (34)
  - S Agriculture (General) (5)
  - SB Plant culture (7)
  - SD Forestry (4)
  - SF Animal culture (13)
  - SH Aquaculture. Fisheries. Angling (5)
- T Technology (19)
  - TA Engineering (General). Civil engineering (General) (2)
  - TD Environmental technology. Sanitary engineering (4)
  - TJ Mechanical engineering and machinery (6)
  - TK Electrical engineering. Electronics Nuclear engineering (7)