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Library of Congress Subject Areas (71065)
- A General Works (2082)
  - AC Collections. Series. Collected works (279)
  - AI Indexes (General) (39)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (261)
  - AZ History of Scholarship The Humanities (11)
  - Government Formal Document (17)
  - UNDIP Formal Documents (1475)
- B Philosophy. Psychology. Religion (1235)
  - B Philosophy (General) (44)
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- C Auxiliary Sciences of History (15)
  - C Auxiliary sciences of history (General) (9)
  - CB History of civilization (5)
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- D History General and Old World (262)
  - D History (General) (245)
    - D051 Ancient History (24)
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- E History America (2)
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- F History United States, Canada, Latin America (4)
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- G Geography. Anthropology. Recreation (1511)
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- H Social Sciences (15876)
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- J Political Science (1027)
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- L Education (1806)
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- M Music and Books on Music (30)
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- N Fine Arts (3164)
  - N Visual arts (General) For photography, see TR (25)
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- P Language and Literature (2607)
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    - P1-1091 Philology. Linguistics (541)
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        P118-118.75 Language acquisition (8)
        P121-149 Science of language (Linguistics) (64)
        P201-299 Comparative grammar (14)
        P301-301.5 Style. Composition. Rhetoric (7)
        P302-302.87 Discourse analysis (20)
        P306-310 Translating and interpreting (9)
        P325-325.5 Semantics (70)
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        P375-381 Linguistic geography (2)
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  - PQ Romance literatures (144)
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- Q Science (8758)
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- R Medicine (14230)
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  - RA Public aspects of medicine (7927)
    - RA0421 Public health. Hygiene. Preventive Medicine (7756)
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  - RB Pathology (107)
  - RC Internal medicine (350)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (51)
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    - RC1200 Sports Medicine (23)
  - RD Surgery (152)
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  - RS Pharmacy and materia medica (126)
  - RT Nursing (1341)
  - RV Botanic, Thomsonian, and eclectic medicine (216)
  - RX Homeopathy (5)
  - RZ Other systems of medicine (305)
- S Agriculture (5153)
  - S Agriculture (General) (2378)
  - SB Plant culture (59)
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  - SF Animal culture (2150)
  - SH Aquaculture. Fisheries. Angling (1121)
- T Technology (10369)
  - Computer engineering. Embedded system. Network. Softwares. Robotics. Multimedia (385)
  - T Technology (General) (1923)
    - T201 Patents. Trademarks (32)
  - TA Engineering (General). Civil engineering (General) (1794)
  - TC Hydraulic engineering. Ocean engineering (73)
  - TD Environmental technology. Sanitary engineering (1244)
  - TE Highway engineering. Roads and pavements (91)
  - TF Railroad engineering and operation (8)
  - TG Bridge engineering (3)
  - TH Building construction (156)
  - TJ Mechanical engineering and machinery (1199)
  - TK Electrical engineering. Electronics Nuclear engineering (1157)
  - TL Motor vehicles. Aeronautics. Astronautics (8)
  - TN Mining engineering. Metallurgy (23)
  - TP Chemical technology (2281)
  - TR Photography (5)
  - TS Manufactures (1189)
  - TT Handicrafts Arts and crafts (5)
  - TX Home economics (37)
- V Naval Science (125)
  - V Naval Science (General) (30)
  - VM Naval architecture. Shipbuilding. Marine engineering (98)
- Z Bibliography. Library Science. Information Resources (645)
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  - Z665 Library Science. Information Science (569)
  - Z719 Libraries (General) (54)
  - ZA Information resources (19)
    - ZA4050 Electronic information resources (16)
    - ZA4450 Databases (1)