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Library of Congress Subject Areas (19442)
- A General Works (28)
  - AC Collections. Series. Collected works (5)
  - AI Indexes (General) (5)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (17)
- B Philosophy. Psychology. Religion (802)
  - B Philosophy (General) (7)
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- C Auxiliary Sciences of History (9)
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- D History General and Old World (256)
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- E History America (1)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (1295)
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- H Social Sciences (8106)
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  - HN Social history and conditions. Social problems. Social reform (157)
  - HQ The family. Marriage. Woman (369)
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  - HT Communities. Classes. Races (210)
  - HV Social pathology. Social and public welfare (564)
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- J Political Science (1690)
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- K Law (679)
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- L Education (3586)
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  - LC Special aspects of education (342)
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  - LD Individual institutions (United States) (1)
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- M Music and Books on Music (64)
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- N Fine Arts (80)
  - N Visual arts (General) For photography, see TR (41)
  - NA Architecture (3)
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  - NX Arts in general (27)
- P Language and Literature (494)
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  - PZ Childrens literature (1)
- Q Science (2063)
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- R Medicine (153)
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  - RA Public aspects of medicine (93)
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  - RZ Other systems of medicine (1)
- S Agriculture (119)
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  - SB Plant culture (11)
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  - SF Animal culture (8)
  - SH Aquaculture. Fisheries. Angling (23)
- T Technology (1759)
  - T Technology (General) (849)
    - T201 Patents. Trademarks (3)
  - TA Engineering (General). Civil engineering (General) (18)
  - TC Hydraulic engineering. Ocean engineering (2)
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  - TE Highway engineering. Roads and pavements (15)
  - TF Railroad engineering and operation (4)
  - TH Building construction (179)
  - TJ Mechanical engineering and machinery (25)
  - TK Electrical engineering. Electronics Nuclear engineering (209)
  - TL Motor vehicles. Aeronautics. Astronautics (16)
  - TP Chemical technology (1)
  - TR Photography (15)
  - TS Manufactures (388)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (24)
- U Military Science (40)
  - U Military Science (General) (40)
- V Naval Science (2)
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  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (120)
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  - Z665 Library Science. Information Science (33)
  - Z719 Libraries (General) (35)
  - ZA Information resources (13)
    - ZA4050 Electronic information resources (8)
    - ZA4450 Databases (1)