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Library of Congress Subject Areas (18550)
- 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 (2151)
  - B Philosophy (General) (34)
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- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (1)
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    - CD921 Archives (3)
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- D History General and Old World (197)
  - D History (General) (37)
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    - D901 Europe (General) (6)
  - DA Great Britain (36)
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  - DE The Mediterranean Region. The Greco-Roman World (7)
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  - DS Asia (51)
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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)
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- G Geography. Anthropology. Recreation (469)
  - G Geography (General) (48)
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- H Social Sciences (5890)
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  - HQ The family. Marriage. Woman (197)
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  - HV Social pathology. Social and public welfare (228)
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- J Political Science (995)
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  - JV Colonies and colonization. Emigration and immigration. International migration (114)
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- K Law (797)
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- L Education (434)
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  - LC Special aspects of education (20)
    - LC5201 Education extension. Adult education. Continuing education (7)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (560)
  - M Music (337)
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- N Fine Arts (140)
  - N Visual arts (General) For photography, see TR (22)
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- P Language and Literature (992)
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    - PN2000 Dramatic representation. The Theater (9)
  - PQ Romance literatures (1)
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- Q Science (3621)
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    - QA75 Electronic computers. Computer science (1725)
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  - QB Astronomy (12)
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  - QD Chemistry (63)
  - QE Geology (5)
  - QH Natural history (127)
    - QH301 Biology (61)
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  - QP Physiology (28)
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    - QR180 Immunology (75)
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- R Medicine (4720)
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  - RA Public aspects of medicine (1338)
    - RA0421 Public health. Hygiene. Preventive Medicine (695)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (8)
  - RC Internal medicine (1581)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (93)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (793)
    - RC1200 Sports Medicine (1)
  - RD Surgery (24)
  - RE Ophthalmology (638)
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  - RG Gynecology and obstetrics (426)
  - RJ Pediatrics (309)
    - RJ101 Child Health. Child health services (122)
  - RK Dentistry (3)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (54)
  - RS Pharmacy and materia medica (10)
  - RT Nursing (640)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (38)
- S Agriculture (75)
  - S Agriculture (General) (32)
  - SB Plant culture (12)
  - SD Forestry (1)
  - SF Animal culture (16)
- T Technology (3009)
  - T Technology (General) (148)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1320)
  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (23)
  - TE Highway engineering. Roads and pavements (9)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (27)
  - TH Building construction (146)
  - TJ Mechanical engineering and machinery (545)
  - TK Electrical engineering. Electronics Nuclear engineering (715)
  - TL Motor vehicles. Aeronautics. Astronautics (307)
  - TN Mining engineering. Metallurgy (3)
  - TP Chemical technology (6)
  - TR Photography (6)
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  - TX Home economics (74)
- U Military Science (30)
  - U Military Science (General) (2)
- V Naval Science (22)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (10)
- Z Bibliography. Library Science. Information Resources (781)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (680)
  - Z719 Libraries (General) (11)
  - ZA Information resources (91)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)