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Library of Congress Subject Areas (3731)
- A General Works (33)
  - AC Collections. Series. Collected works (16)
  - AI Indexes (General) (1)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (13)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (113)
  - B Philosophy (General) (30)
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- D History General and Old World (65)
  - D History (General) (35)
    - D051 Ancient History (1)
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    - D839 Post-war History, 1945 on (3)
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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 (895)
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  - LC Special aspects of education (114)
    - LC5201 Education extension. Adult education. Continuing education (72)
  - LG Individual institutions (Asia. Africa) (8)
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- M Music and Books on Music (545)
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- N Fine Arts (624)
  - N Visual arts (General) For photography, see TR (385)
  - NA Architecture (9)
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  - NX Arts in general (171)
- P Language and Literature (194)
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    - P Philology. Linguistics (34)
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- Q Science (393)
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- R Medicine (267)
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  - RZ Other systems of medicine (55)
- S Agriculture (44)
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  - 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 (455)
  - T Technology (General) (111)
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  - TA Engineering (General). Civil engineering (General) (45)
  - TD Environmental technology. Sanitary engineering (8)
  - TE Highway engineering. Roads and pavements (15)
  - TJ Mechanical engineering and machinery (42)
  - TK Electrical engineering. Electronics Nuclear engineering (28)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
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  - TP Chemical technology (8)
  - TQ Biomedical technology (6)
  - TR Photography (249)
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  - 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)