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Library of Congress Subject Areas (10067)
- A General Works (44)
  - AC Collections. Series. Collected works (31)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (8)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (583)
  - B Philosophy (General) (118)
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- C Auxiliary Sciences of History (63)
  - C Auxiliary sciences of history (General) (24)
  - CB History of civilization (4)
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    - CD921 Archives (5)
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- D History General and Old World (137)
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- E History America (36)
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  - E151 United States (General) (5)
- F History United States, Canada, Latin America (89)
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- G Geography. Anthropology. Recreation (756)
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- H Social Sciences (3174)
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- K Law (582)
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- L Education (2617)
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  - LC Special aspects of education (658)
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  - LE Individual institutions (America except United States) (41)
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  - LT Textbooks (46)
- M Music and Books on Music (263)
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- N Fine Arts (816)
  - N Visual arts (General) For photography, see TR (105)
  - NA Architecture (395)
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- P Language and Literature (498)
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- Q Science (1949)
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- R Medicine (1450)
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  - RA Public aspects of medicine (740)
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  - RB Pathology (72)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (39)
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    - RJ101 Child Health. Child health services (63)
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  - RM Therapeutics. Pharmacology (43)
  - RS Pharmacy and materia medica (57)
  - RT Nursing (267)
  - RV Botanic, Thomsonian, and eclectic medicine (6)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (112)
- S Agriculture (1145)
  - S Agriculture (General) (848)
  - SB Plant culture (446)
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  - SF Animal culture (382)
  - SH Aquaculture. Fisheries. Angling (78)
- T Technology (1049)
  - T Technology (General) (818)
    - T201 Patents. Trademarks (4)
  - TA Engineering (General). Civil engineering (General) (63)
  - TC Hydraulic engineering. Ocean engineering (40)
  - TD Environmental technology. Sanitary engineering (69)
  - TE Highway engineering. Roads and pavements (18)
  - TF Railroad engineering and operation (1)
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  - TH Building construction (27)
  - TJ Mechanical engineering and machinery (9)
  - TK Electrical engineering. Electronics Nuclear engineering (24)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (22)
  - TR Photography (8)
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  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (10)
- U Military Science (8)
  - U Military Science (General) (8)
- V Naval Science (36)
  - V Naval Science (General) (26)
  - VM Naval architecture. Shipbuilding. Marine engineering (17)
- Z Bibliography. Library Science. Information Resources (181)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (47)
  - Z719 Libraries (General) (15)
  - ZA Information resources (148)
    - ZA4050 Electronic information resources (67)
    - ZA4450 Databases (17)