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Library of Congress Subject Areas (66816)
- A General Works (46)
  - AC Collections. Series. Collected works (8)
  - AI Indexes (General) (6)
  - AM Museums (General). Collectors and collecting (General) (25)
  - AS Academies and learned societies (General) (3)
  - AZ History of Scholarship The Humanities (9)
- B Philosophy. Psychology. Religion (3773)
  - B Philosophy (General) (352)
  - BC Logic (5)
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  - BH Aesthetics (53)
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  - BL Religion (64)
  - BM Judaism (116)
  - BP Islam. Bahaism. Theosophy, etc (42)
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  - BT Doctrinal Theology (3)
  - BV Practical Theology (3)
    - BV1460 Religious Education (2)
  - BX Christian Denominations (14)
- C Auxiliary Sciences of History (822)
  - C Auxiliary sciences of history (General) (67)
  - CB History of civilization (28)
  - CC Archaeology (674)
  - CD Diplomatics. Archives. Seals (11)
    - CD921 Archives (7)
  - CE Technical chronology. Calendar (1)
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  - CT Biography (47)
- D History General and Old World (1398)
  - D History (General) (644)
    - D051 Ancient History (52)
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    - D839 Post-war History, 1945 on (39)
    - D880 Developing Countries (6)
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    - D901 Europe (General) (66)
  - DA Great Britain (319)
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- E History America (33)
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- F History United States, Canada, Latin America (42)
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- G Geography. Anthropology. Recreation (7710)
  - G Geography (General) (1036)
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- H Social Sciences (11829)
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  - HQ The family. Marriage. Woman (919)
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  - HV Social pathology. Social and public welfare (577)
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- J Political Science (1446)
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- K Law (1006)
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- L Education (2357)
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- M Music and Books on Music (625)
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- N Fine Arts (724)
  - N Visual arts (General) For photography, see TR (201)
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- P Language and Literature (1193)
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    - PN2000 Dramatic representation. The Theater (37)
  - PQ Romance literatures (25)
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  - PZ Childrens literature (5)
- Q Science (27482)
  - Q Science (General) (722)
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  - QB Astronomy (584)
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  - QH Natural history (5405)
    - QH301 Biology (3674)
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  - QP Physiology (862)
  - QR Microbiology (1195)
    - QR180 Immunology (708)
    - QR355 Virology (166)
- R Medicine (15541)
  - R Medicine (General) (3905)
  - RA Public aspects of medicine (1556)
    - RA0421 Public health. Hygiene. Preventive Medicine (835)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (46)
  - RB Pathology (1379)
  - RC Internal medicine (3633)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1388)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (1753)
    - RC1200 Sports Medicine (38)
  - RD Surgery (422)
  - RE Ophthalmology (157)
  - RF Otorhinolaryngology (394)
  - RG Gynecology and obstetrics (663)
  - RJ Pediatrics (974)
    - RJ101 Child Health. Child health services (477)
  - RK Dentistry (23)
  - RL Dermatology (172)
  - RM Therapeutics. Pharmacology (1140)
  - RS Pharmacy and materia medica (171)
  - RT Nursing (2122)
  - RV Botanic, Thomsonian, and eclectic medicine (26)
  - RX Homeopathy (54)
  - RZ Other systems of medicine (388)
- S Agriculture (346)
  - S Agriculture (General) (147)
  - SB Plant culture (83)
  - SD Forestry (29)
  - SF Animal culture (61)
  - SH Aquaculture. Fisheries. Angling (39)
- T Technology (18170)
  - T Technology (General) (1422)
    - T201 Patents. Trademarks (8)
  - TA Engineering (General). Civil engineering (General) (6858)
  - TC Hydraulic engineering. Ocean engineering (430)
  - TD Environmental technology. Sanitary engineering (695)
  - TE Highway engineering. Roads and pavements (285)
  - TF Railroad engineering and operation (168)
  - TG Bridge engineering (22)
  - TH Building construction (135)
  - TJ Mechanical engineering and machinery (798)
  - TK Electrical engineering. Electronics Nuclear engineering (5917)
  - TL Motor vehicles. Aeronautics. Astronautics (1616)
  - TN Mining engineering. Metallurgy (413)
  - TP Chemical technology (429)
  - TR Photography (26)
  - TS Manufactures (149)
  - TT Handicrafts Arts and crafts (98)
  - TX Home economics (1)
- U Military Science (155)
  - U Military Science (General) (155)
- V Naval Science (857)
  - V Naval Science (General) (168)
  - VM Naval architecture. Shipbuilding. Marine engineering (735)
- Z Bibliography. Library Science. Information Resources (450)
  - Z004 Books. Writing. Paleography (102)
  - Z665 Library Science. Information Science (116)
  - Z719 Libraries (General) (13)
  - ZA Information resources (229)
    - ZA4050 Electronic information resources (144)
    - ZA4450 Databases (45)