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Library of Congress Subject Areas (723)
- A General Works (3)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors & collecting (General) (2)
- C Auxiliary Sciences of History (1)
  - CC Archaeology (1)
- D History General & Old World (5)
  - D History (General) (3)
    - D051 Ancient History (1)
    - D839 Post-war History, 1945 on (1)
  - DS Asia (1)
  - DU Oceania (South Seas) (1)
- E History America (1)
  - E11 America (General) (1)
- G Geography. Anthropology. Recreation (55)
  - G Geography (General) (23)
  - GA Mathematical geography. Cartography (7)
  - GB Physical geography (1)
  - GC Oceanography (2)
  - GE Environmental Sciences (7)
  - GV Recreation Leisure (18)
- H Social Sciences (482)
  - H Social Sciences (General) (179)
  - HA Statistics (1)
  - HB Economic Theory (127)
  - HC Economic History & Conditions (26)
  - HD Industries. Land use. Labor (94)
    - HD28 Management. Industrial Management (79)
    - HD61 Risk Management (4)
  - HE Transportation & Communications (2)
  - HF Commerce (364)
    - HF5601 Accounting (76)
  - HG Finance (122)
  - HJ Public Finance (6)
  - HM Sociology (2)
  - HN Social history & conditions. Social problems. Social reform (5)
  - HQ The family. Marriage. Woman (4)
  - HT Communities. Classes. Races (1)
- J Political Science (6)
  - JA Political science (General) (5)
  - JX International law (1)
- K Law (6)
  - K Law (General) (6)
  - KD England & Wales (1)
- L Education (10)
  - L Education (General) (9)
  - LA History of education (1)
  - LC Special aspects of education (3)
    - LC5201 Education extension. Adult education. Continuing education (3)
- M Music & Books on Music (3)
  - M Music (3)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language & Literature (2)
  - P Philology. Linguistics (2)
  - PE English (2)
  - PL Languages & literatures of Eastern Asia, Africa, Oceania (2)
- Q Science (224)
  - Q Science (General) (42)
  - QA Mathematics (178)
    - QA75 Electronic computers. Computer science (31)
    - QA76 Computer software (165)
  - QC Physics (2)
  - QD Chemistry (1)
  - QE Geology (2)
  - QH Natural history (5)
    - QH301 Biology (3)
    - QH426 Genetics (2)
  - QK Botany (4)
  - QL Zoology (13)
  - QM Human anatomy (2)
  - QR Microbiology (1)
- R Medicine (8)
  - R Medicine (General) (6)
  - RA Public aspects of medicine (2)
    - RA0421 Public health. Hygiene. Preventive Medicine (2)
- S Agriculture (1)
  - S Agriculture (General) (1)
- T Technology (45)
  - T Technology (General) (45)
  - TR Photography (1)
- Z Bibliography. Library Science. Information Resources (2)
  - ZA Information resources (2)
    - ZA4050 Electronic information resources (2)
    - ZA4450 Databases (2)