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Library of Congress Subject Areas (22047)
- A General Works (36)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (19)
  - AS Academies and learned societies (General) (3)
  - AZ History of Scholarship The Humanities (15)
- B Philosophy. Psychology. Religion (2668)
  - B Philosophy (General) (20)
  - BF Psychology (2561)
  - BJ Ethics (41)
  - BL Religion (60)
  - BP Islam. Bahaism. Theosophy, etc (9)
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  - BV Practical Theology (2)
- C Auxiliary Sciences of History (247)
  - C Auxiliary sciences of history (General) (4)
  - CB History of civilization (28)
  - CC Archaeology (226)
  - CD Diplomatics. Archives. Seals (6)
    - CD921 Archives (5)
  - CT Biography (1)
- D History General and Old World (131)
  - D History (General) (105)
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    - D501 World War I (7)
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    - D839 Post-war History, 1945 on (11)
    - D901 Europe (General) (1)
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- E History America (19)
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- F History United States, Canada, Latin America (6)
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- G Geography. Anthropology. Recreation (2514)
  - G Geography (General) (233)
    - G149 Travel. Voyages and travels (General) (158)
      - G154.9 Travel and state. Tourism (146)
  - GA Mathematical geography. Cartography (4)
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  - GT Manners and customs (89)
    - GT500 Costume. Dress. Fashion (69)
  - GV Recreation Leisure (913)
    - GV1580 Dancing (14)
    - GV561 Sports (840)
      - GV711 Coaching (211)
- H Social Sciences (3339)
  - H Social Sciences (General) (380)
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  - HQ The family. Marriage. Woman (161)
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  - HV Social pathology. Social and public welfare. Criminology (791)
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  - HX Socialism. Communism. Anarchism (5)
- J Political Science (220)
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- K Law (416)
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- L Education (1421)
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    - LB2300 Higher Education (451)
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- M Music and Books on Music (70)
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- N Fine Arts (573)
  - N Visual arts (General) For photography, see TR (210)
  - N4390-5098 Exhibitions (24)
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  - NX Arts in general (180)
- P Language and Literature (419)
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  - PN Literature (General) (360)
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    - PN2000 Dramatic representation. The Theater (24)
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- Q Science (7433)
  - Q Science (General) (90)
  - QA Mathematics (1829)
    - QA75 Electronic computers. Computer science (1404)
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  - QB Astronomy (2678)
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  - QH Natural history (1579)
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- R Medicine (7351)
  - R Medicine (General) (656)
  - RA Public aspects of medicine (2104)
    - RA0421 Public health. Hygiene. Preventive Medicine (1653)
      - RA0440 Study and Teaching. Research (133)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (131)
    - RA1190 Toxicology. Poisions (85)
  - RB Pathology (9)
  - RC Internal medicine (3031)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (151)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (430)
    - RC1200 Sports Medicine (2430)
  - RD Surgery (67)
  - RE Ophthalmology (20)
  - RF Otorhinolaryngology (4)
  - RG Gynecology and obstetrics (226)
  - RJ Pediatrics (289)
    - RJ101 Child Health. Child health services (205)
  - RK Dentistry (32)
  - RL Dermatology (22)
  - RM Therapeutics. Pharmacology (1168)
  - RS Pharmacy and materia medica (837)
  - RT Nursing (434)
  - RV Botanic, Thomsonian, and eclectic medicine (145)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (31)
- S Agriculture (225)
  - S Agriculture (General) (102)
  - SB Plant culture (25)
  - SD Forestry (17)
  - SF Animal culture (54)
  - SH Aquaculture. Fisheries. Angling (44)
- T Technology (3546)
  - T Technology (General) (753)
    - T58.5 Information Technology (45)
  - TA Engineering (General). Civil engineering (General) (1732)
  - TC Hydraulic engineering. Ocean engineering (204)
  - TD Environmental technology. Sanitary engineering (319)
  - TE Highway engineering. Roads and pavements (76)
  - TF Railroad engineering and operation (10)
  - TG Bridge engineering (8)
  - TH Building construction (357)
  - TJ Mechanical engineering and machinery (201)
  - TK Electrical engineering. Electronics. Nuclear engineering (372)
  - TL Motor vehicles. Aeronautics. Astronautics (65)
  - TN Mining engineering. Metallurgy (40)
  - TP Chemical technology (109)
  - TR Photography (33)
  - TS Manufactures (31)
  - TT Handicrafts Arts and crafts (11)
    - TT490 Clothing manufacture. Dressmaking.Tailoring (8)
  - TX Home economics (358)
    - TX341 Nutrition. Foods and food supply (355)
- U Military Science (16)
  - U Military Science (General) (16)
- V Naval Science (268)
  - V Naval Science (General) (30)
  - VM Naval architecture. Shipbuilding. Marine engineering (244)
- Z Bibliography. Library Science. Information Resources (54)
  - Z004 Books. Writing. Paleography (12)
  - Z665 Library Science. Information Science (17)
  - Z719 Libraries (General) (10)
  - ZA Information resources (30)
    - ZA4050 Electronic information resources (16)
    - ZA4450 Databases (2)