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Library of Congress Subject Areas (29737)
- A General Works (83)
  - AC Collections. Series. Collected works (7)
  - AI Indexes (General) (7)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (67)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1183)
  - B Philosophy (General) (20)
  - BC Logic (3)
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  - BJ Ethics (40)
  - BL Religion (76)
  - BP Islam. Bahaism. Theosophy, etc (853)
  - BQ Buddhism (3)
  - BV Practical Theology (18)
    - BV1460 Religious Education (18)
- C Auxiliary Sciences of History (60)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (6)
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  - CD Diplomatics. Archives. Seals (30)
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- D History General and Old World (368)
  - D History (General) (52)
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    - D839 Post-war History, 1945 on (1)
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- E History America (5)
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- F History United States, Canada, Latin America (3)
  - F001 United States local history (3)
- G Geography. Anthropology. Recreation (1564)
  - G Geography (General) (272)
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- H Social Sciences (13284)
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  - HQ The family. Marriage. Woman (407)
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  - HV Social pathology. Social and public welfare (749)
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- J Political Science (2338)
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  - JV Colonies and colonization. Emigration and immigration. International migration (43)
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- K Law (1485)
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- L Education (4623)
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  - LC Special aspects of education (447)
    - LC5201 Education extension. Adult education. Continuing education (203)
  - LD Individual institutions (United States) (1)
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  - LG Individual institutions (Asia. Africa) (799)
  - LT Textbooks (6)
- M Music and Books on Music (73)
  - M Music (68)
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- N Fine Arts (104)
  - N Visual arts (General) For photography, see TR (51)
  - NA Architecture (4)
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- P Language and Literature (712)
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    - PN2000 Dramatic representation. The Theater (3)
  - PR English literature (1)
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- Q Science (3476)
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- R Medicine (218)
  - R Medicine (General) (64)
  - RA Public aspects of medicine (120)
    - RA0421 Public health. Hygiene. Preventive Medicine (43)
  - RC Internal medicine (13)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
  - RD Surgery (2)
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    - RJ101 Child Health. Child health services (5)
  - RK Dentistry (1)
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  - RM Therapeutics. Pharmacology (2)
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  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (1)
- S Agriculture (167)
  - S Agriculture (General) (109)
  - SB Plant culture (16)
  - SD Forestry (5)
  - SF Animal culture (13)
  - SH Aquaculture. Fisheries. Angling (27)
- T Technology (2348)
  - T Technology (General) (1230)
    - T201 Patents. Trademarks (10)
  - TA Engineering (General). Civil engineering (General) (37)
  - TC Hydraulic engineering. Ocean engineering (4)
  - TD Environmental technology. Sanitary engineering (70)
  - TE Highway engineering. Roads and pavements (19)
  - TF Railroad engineering and operation (4)
  - TH Building construction (221)
  - TJ Mechanical engineering and machinery (32)
  - TK Electrical engineering. Electronics Nuclear engineering (234)
  - TL Motor vehicles. Aeronautics. Astronautics (25)
  - TP Chemical technology (5)
  - TR Photography (17)
  - TS Manufactures (433)
  - TT Handicrafts Arts and crafts (7)
  - TX Home economics (40)
- U Military Science (54)
  - U Military Science (General) (54)
- V Naval Science (5)
  - V Naval Science (General) (3)
  - VM Naval architecture. Shipbuilding. Marine engineering (2)
- Z Bibliography. Library Science. Information Resources (164)
  - Z004 Books. Writing. Paleography (44)
  - Z665 Library Science. Information Science (39)
  - Z719 Libraries (General) (42)
  - ZA Information resources (41)
    - ZA4050 Electronic information resources (33)
    - ZA4450 Databases (5)