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Library of Congress Subject Areas (19613)
- A General Works (8)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (2279)
  - B Philosophy (General) (37)
  - BC Logic (4)
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- C Auxiliary Sciences of History (9)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
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    - CD921 Archives (3)
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- D History General and Old World (223)
  - D History (General) (46)
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  - DA Great Britain (39)
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  - DE The Mediterranean Region. The Greco-Roman World (7)
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- E History America (25)
  - E11 America (General) (3)
  - E151 United States (General) (19)
- F History United States, Canada, Latin America (37)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (32)
- G Geography. Anthropology. Recreation (506)
  - G Geography (General) (52)
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- H Social Sciences (6207)
  - H Social Sciences (General) (134)
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  - HB Economic Theory (846)
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  - HQ The family. Marriage. Woman (202)
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  - HT Communities. Classes. Races (165)
  - HV Social pathology. Social and public welfare (236)
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- J Political Science (1095)
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- K Law (863)
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- L Education (473)
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    - LB1501 Primary Education (11)
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  - LC Special aspects of education (21)
    - LC5201 Education extension. Adult education. Continuing education (7)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (580)
  - M Music (355)
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  - MT Musical instruction and study (18)
- N Fine Arts (143)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (1036)
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- Q Science (3818)
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    - QA75 Electronic computers. Computer science (1810)
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  - QB Astronomy (12)
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  - QH Natural history (135)
    - QH301 Biology (69)
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    - QR180 Immunology (87)
    - QR355 Virology (60)
- R Medicine (5157)
  - R Medicine (General) (252)
  - RA Public aspects of medicine (1556)
    - RA0421 Public health. Hygiene. Preventive Medicine (885)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (8)
  - RC Internal medicine (1719)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (100)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (866)
    - RC1200 Sports Medicine (1)
  - RD Surgery (24)
  - RE Ophthalmology (676)
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  - RG Gynecology and obstetrics (463)
  - RJ Pediatrics (361)
    - RJ101 Child Health. Child health services (158)
  - RK Dentistry (3)
  - RL Dermatology (11)
  - RM Therapeutics. Pharmacology (56)
  - RS Pharmacy and materia medica (13)
  - RT Nursing (672)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (52)
- S Agriculture (79)
  - S Agriculture (General) (36)
  - SB Plant culture (12)
  - SD Forestry (1)
  - SF Animal culture (16)
- T Technology (3226)
  - T Technology (General) (191)
    - T201 Patents. Trademarks (2)
  - TA Engineering (General). Civil engineering (General) (1404)
  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (27)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (7)
  - TG Bridge engineering (27)
  - TH Building construction (164)
  - TJ Mechanical engineering and machinery (577)
  - TK Electrical engineering. Electronics Nuclear engineering (765)
  - TL Motor vehicles. Aeronautics. Astronautics (324)
  - TN Mining engineering. Metallurgy (5)
  - TP Chemical technology (7)
  - TR Photography (7)
  - TS Manufactures (6)
  - TX Home economics (78)
- U Military Science (35)
  - U Military Science (General) (5)
- V Naval Science (27)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (15)
- Z Bibliography. Library Science. Information Resources (792)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (687)
  - Z719 Libraries (General) (11)
  - ZA Information resources (94)
    - ZA4050 Electronic information resources (70)
    - ZA4450 Databases (10)