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Library of Congress Subject Areas (3728)
- A General Works (34)
  - AC Collections. Series. Collected works (16)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (14)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (114)
  - B Philosophy (General) (31)
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- D History General and Old World (67)
  - D History (General) (37)
    - D051 Ancient History (1)
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    - D731 World War II (2)
    - D839 Post-war History, 1945 on (3)
    - D880 Developing Countries (1)
    - D901 Europe (General) (1)
  - DA Great Britain (7)
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- E History America (6)
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- F History United States, Canada, Latin America (2)
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- G Geography. Anthropology. Recreation (57)
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- H Social Sciences (1013)
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- J Political Science (45)
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- K Law (52)
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- L Education (884)
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  - LC Special aspects of education (113)
    - LC5201 Education extension. Adult education. Continuing education (71)
  - LG Individual institutions (Asia. Africa) (8)
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- M Music and Books on Music (531)
  - M Music (477)
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- N Fine Arts (620)
  - N Visual arts (General) For photography, see TR (388)
  - NA Architecture (9)
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  - NX Arts in general (166)
- P Language and Literature (193)
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    - P 87-96 Communication. Mass media (5)
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    - P Philology. Linguistics (35)
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- Q Science (398)
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- R Medicine (269)
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  - RG Gynecology and obstetrics (8)
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  - RM Therapeutics. Pharmacology (7)
  - RT Nursing (145)
  - RZ Other systems of medicine (55)
- S Agriculture (45)
  - S Agriculture (General) (15)
  - SB Plant culture (2)
  - SD Forestry (2)
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  - SF600 Veterinary Medicine (24)
  - SH Aquaculture. Fisheries. Angling (3)
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- T Technology (445)
  - T Technology (General) (119)
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  - TA Engineering (General). Civil engineering (General) (41)
  - TD Environmental technology. Sanitary engineering (7)
  - TE Highway engineering. Roads and pavements (12)
  - TJ Mechanical engineering and machinery (39)
  - TK Electrical engineering. Electronics Nuclear engineering (26)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
  - TN Mining engineering. Metallurgy (12)
  - TP Chemical technology (6)
  - TQ Biomedical technology (5)
  - TR Photography (240)
  - TS Manufactures (19)
  - TT Handicrafts Arts and crafts (2)
  - TX Home economics (4)
- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (45)
  - Z004 Books. Writing. Paleography (1)
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  - Z719 Libraries (General) (16)
  - ZA Information resources (22)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (2)