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Library of Congress Subject Areas (4512)
- B Philosophy. Psychology. Religion (294)
  - B Philosophy (General) (20)
  - BF Psychology (5)
  - BP Islam. Bahaism. Theosophy, etc (18)
  - BV Practical Theology (5)
    - BV1460 Religious Education (3)
  - Islamic Studies (255)
  - BC Logic (1)
- G Geography. Anthropology. Recreation (4)
  - G Geography (General) (3)
  - GV Recreation Leisure (1)
- H Social Sciences (1103)
  - H Social Sciences (General) (61)
  - HA Statistics (3)
  - HB Economic Theory (346)
  - HC Economic History and Conditions (37)
  - HD Industries. Land use. Labor (401)
    - HD28 Management. Industrial Management (226)
    - HD61 Risk Management (7)
  - HE Transportation and Communications (117)
  - HF Commerce (73)
    - HF5601 Accounting (67)
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  - HM Sociology (11)
  - HN Social history and conditions. Social problems. Social reform (6)
  - HQ The family. Marriage. Woman (1)
  - HS Societies secret benevolent etc (1)
  - HT Communities. Classes. Races (5)
- J Political Science (189)
  - J General legislative and executive papers (1)
  - JA Political science (General) (37)
  - JC Political theory (5)
  - JF Political institutions (General) (121)
  - JS Local government Municipal government (26)
- K Law (118)
  - K Law (General) (118)
- L Education (160)
  - L Education (General) (142)
  - LA History of education (1)
  - LB Theory and practice of education (23)
    - LB1501 Primary Education (16)
    - LB1603 Secondary Education. High schools (3)
    - LB2300 Higher Education (3)
  - LC Special aspects of education (1)
- N Fine Arts (4)
  - N Visual arts (General) For photography, see TR (1)
  - NX Arts in general (4)
- P Language and Literature (224)
  - P Philology. Linguistics (4)
  - PE English (212)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (3)
  - PN Literature (General) (1)
  - PR English literature (8)
- Q Science (396)
  - Q Science (General) (7)
  - QA Mathematics (378)
    - QA75 Electronic computers. Computer science (3)
    - QA76 Computer software (3)
  - QC Physics (7)
  - QM Human anatomy (3)
  - QP Physiology (2)
  - QR Microbiology (1)
- R Medicine (1035)
  - R Medicine (General) (49)
  - RA Public aspects of medicine (6)
    - RA0421 Public health. Hygiene. Preventive Medicine (4)
  - RB Pathology (1)
  - RC Internal medicine (2)
  - RE Ophthalmology (1)
  - RG Midwifery (308)
  - RJ Pediatrics (2)
    - RJ101 Child Health. Child health services (2)
  - RM Therapeutics. Pharmacology (1)
  - RT Nursing (681)
  - RZ Other systems of medicine (1)
- S Agriculture (2)
  - S Agriculture (General) (2)
  - SB Plant culture (1)
- T Technology (1008)
  - T Technology (General) (684)
    - T201 Patents. Trademarks (11)
  - TA Engineering (General). Civil engineering (General) (182)
  - TC Hydraulic engineering. Ocean engineering (3)
  - TJ Mechanical engineering and machinery (91)
  - TK Electrical engineering. Electronics Nuclear engineering (58)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (1)
  - TS Manufactures (7)
- Z Bibliography. Library Science. Information Resources (4)
  - Z665 Library Science. Information Science (1)
  - Z719 Libraries (General) (3)
- A General Works (2)
  - AI Indexes (General) (1)
  - AS Academies and learned societies (General) (1)