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Library of Congress Subject Areas (9931)
- A General Works (45)
  - AC Collections. Series. Collected works (31)
  - AI Indexes (General) (4)
  - AM Museums (General). Collectors and collecting (General) (9)
  - AS Academies and learned societies (General) (1)
- B Philosophy. Psychology. Religion (578)
  - B Philosophy (General) (117)
  - BC Logic (25)
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  - BJ Ethics (53)
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- C Auxiliary Sciences of History (63)
  - C Auxiliary sciences of history (General) (24)
  - CB History of civilization (4)
  - CC Archaeology (20)
  - CD Diplomatics. Archives. Seals (8)
    - CD921 Archives (5)
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- D History General and Old World (136)
  - D History (General) (130)
    - D051 Ancient History (1)
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- E History America (36)
  - E11 America (General) (33)
  - E151 United States (General) (5)
- F History United States, Canada, Latin America (88)
  - F001 United States local history (3)
  - F1201 Latin America (General) (87)
- G Geography. Anthropology. Recreation (741)
  - G Geography (General) (227)
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  - GE Environmental Sciences (374)
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- H Social Sciences (3119)
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  - HQ The family. Marriage. Woman (221)
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- J Political Science (442)
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- K Law (578)
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- L Education (2568)
  - L Education (General) (1777)
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    - LB1501 Primary Education (167)
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    - LB2300 Higher Education (1103)
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  - LC Special aspects of education (644)
    - LC5201 Education extension. Adult education. Continuing education (113)
  - LE Individual institutions (America except United States) (41)
  - LG Individual institutions (Asia. Africa) (1)
  - LT Textbooks (46)
- M Music and Books on Music (259)
  - M Music (235)
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  - MT Musical instruction and study (90)
- N Fine Arts (801)
  - N Visual arts (General) For photography, see TR (103)
  - NA Architecture (390)
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  - NX Arts in general (417)
- P Language and Literature (481)
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  - PN Literature (General) (257)
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    - PN2000 Dramatic representation. The Theater (17)
  - PQ Romance literatures (23)
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- Q Science (1934)
  - Q Science (General) (1099)
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  - QH Natural history (567)
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  - QP Physiology (35)
  - QR Microbiology (226)
    - QR180 Immunology (11)
    - QR355 Virology (70)
- R Medicine (1431)
  - R Medicine (General) (681)
  - RA Public aspects of medicine (730)
    - RA0421 Public health. Hygiene. Preventive Medicine (478)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (35)
  - RB Pathology (71)
  - RC Internal medicine (145)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (38)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (20)
    - RC1200 Sports Medicine (5)
  - RD Surgery (9)
  - RE Ophthalmology (5)
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  - RG Gynecology and obstetrics (41)
  - RJ Pediatrics (97)
    - RJ101 Child Health. Child health services (61)
  - RK Dentistry (133)
  - RL Dermatology (4)
  - RM Therapeutics. Pharmacology (43)
  - RS Pharmacy and materia medica (56)
  - RT Nursing (262)
  - RV Botanic, Thomsonian, and eclectic medicine (6)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (110)
- S Agriculture (1138)
  - S Agriculture (General) (841)
  - SB Plant culture (442)
  - SD Forestry (134)
  - SF Animal culture (380)
  - SH Aquaculture. Fisheries. Angling (78)
- T Technology (1014)
  - T Technology (General) (785)
    - T201 Patents. Trademarks (4)
  - TA Engineering (General). Civil engineering (General) (62)
  - TC Hydraulic engineering. Ocean engineering (40)
  - TD Environmental technology. Sanitary engineering (68)
  - TE Highway engineering. Roads and pavements (18)
  - TF Railroad engineering and operation (1)
  - TG Bridge engineering (1)
  - TH Building construction (26)
  - TJ Mechanical engineering and machinery (7)
  - TK Electrical engineering. Electronics Nuclear engineering (24)
  - TL Motor vehicles. Aeronautics. Astronautics (5)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (22)
  - TR Photography (8)
  - TS Manufactures (17)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (10)
- U Military Science (8)
  - U Military Science (General) (8)
- V Naval Science (36)
  - V Naval Science (General) (26)
  - VM Naval architecture. Shipbuilding. Marine engineering (17)
- Z Bibliography. Library Science. Information Resources (176)
  - Z004 Books. Writing. Paleography (3)
  - Z665 Library Science. Information Science (47)
  - Z719 Libraries (General) (15)
  - ZA Information resources (143)
    - ZA4050 Electronic information resources (66)
    - ZA4450 Databases (17)