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Library of Congress Subject Areas (9068)
- A General Works (262)
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  - AI Indexes (General) (40)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (72)
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- B Philosophy. Psychology. Religion (249)
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- C Auxiliary Sciences of History (11)
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- D History General and Old World (10)
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- E History America (10)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (22)
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- H Social Sciences (169)
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- K Law (18)
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- L Education (1887)
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- M Music and Books on Music (12)
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- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (37)
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- Q Science (1106)
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  - QR Microbiology (253)
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- R Medicine (7436)
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  - RA Public aspects of medicine (981)
    - RA0421 Public health. Hygiene. Preventive Medicine (799)
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  - RB Pathology (197)
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  - RM Therapeutics. Pharmacology (291)
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  - RX Homeopathy (13)
  - RZ Other systems of medicine (244)
- S Agriculture (36)
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- T Technology (167)
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- U Military Science (2)
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- V Naval Science (2)
  - V Naval Science (General) (2)
- Z Bibliography. Library Science. Information Resources (257)
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  - Z665 Library Science. Information Science (80)
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  - ZA Information resources (85)
    - ZA4050 Electronic information resources (7)
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