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Library of Congress Subject Areas (10147)
- 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 (588)
  - B Philosophy (General) (118)
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- C Auxiliary Sciences of History (63)
  - C Auxiliary sciences of history (General) (24)
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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 (37)
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- F History United States, Canada, Latin America (89)
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- G Geography. Anthropology. Recreation (764)
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- H Social Sciences (3210)
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- K Law (593)
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- L Education (2627)
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  - LE Individual institutions (America except United States) (41)
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- M Music and Books on Music (271)
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- N Fine Arts (828)
  - N Visual arts (General) For photography, see TR (106)
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- P Language and Literature (500)
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- Q Science (1962)
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- R Medicine (1455)
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  - RB Pathology (72)
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    - RJ101 Child Health. Child health services (63)
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  - RS Pharmacy and materia medica (57)
  - RT Nursing (268)
  - RV Botanic, Thomsonian, and eclectic medicine (6)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (112)
- S Agriculture (1154)
  - S Agriculture (General) (857)
  - SB Plant culture (450)
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  - SF Animal culture (384)
  - SH Aquaculture. Fisheries. Angling (78)
- T Technology (1064)
  - T Technology (General) (832)
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  - TA Engineering (General). Civil engineering (General) (63)
  - TC Hydraulic engineering. Ocean engineering (41)
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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 (183)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (47)
  - Z719 Libraries (General) (15)
  - ZA Information resources (150)
    - ZA4050 Electronic information resources (68)
    - ZA4450 Databases (17)