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Library of Congress Subject Areas (20106)
- A General Works (197)
  - AC Collections. Series. Collected works (58)
  - AI Indexes (General) (44)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (108)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (244)
  - B Philosophy (General) (14)
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- C Auxiliary Sciences of History (19)
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- D History General and Old World (31)
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- E History America (29)
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- F History United States, Canada, Latin America (8)
  - F001 United States local history (2)
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- G Geography. Anthropology. Recreation (84)
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- H Social Sciences (7621)
  - H Social Sciences (General) (2361)
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  - HB Economic Theory (1861)
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    - HD28 Management. Industrial Management (880)
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- J Political Science (1384)
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- K Law (2572)
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    - KDC Scotland (4)
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- L Education (936)
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    - LB1501 Primary Education (36)
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    - LB2361 Curriculum (3)
  - LC Special aspects of education (22)
    - LC5201 Education extension. Adult education. Continuing education (13)
  - LD Individual institutions (United States) (2)
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- M Music and Books on Music (46)
  - M Music (37)
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  - MT Musical instruction and study (5)
- N Fine Arts (67)
  - N Visual arts (General) For photography, see TR (32)
  - NA Architecture (3)
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- P Language and Literature (46)
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    - PN2000 Dramatic representation. The Theater (2)
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- Q Science (2566)
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  - QM Human anatomy (139)
  - QP Physiology (197)
  - QR Microbiology (57)
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    - QR355 Virology (4)
- R Medicine (5025)
  - R Medicine (General) (2392)
  - RA Public aspects of medicine (1222)
    - RA0421 Public health. Hygiene. Preventive Medicine (1000)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (5)
  - RB Pathology (215)
  - RC Internal medicine (189)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (24)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (44)
    - RC1200 Sports Medicine (39)
  - RD Surgery (66)
  - RE Ophthalmology (17)
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    - RJ101 Child Health. Child health services (116)
  - RK Dentistry (8)
  - RL Dermatology (35)
  - RM Therapeutics. Pharmacology (273)
  - RS Pharmacy and materia medica (160)
  - RT Nursing (1556)
  - RV Botanic, Thomsonian, and eclectic medicine (68)
  - RX Homeopathy (10)
  - RZ Other systems of medicine (359)
- S Agriculture (75)
  - S Agriculture (General) (55)
  - SB Plant culture (8)
  - SD Forestry (8)
  - SF Animal culture (3)
  - SH Aquaculture. Fisheries. Angling (7)
- T Technology (1942)
  - T Technology (General) (884)
    - T201 Patents. Trademarks (6)
  - TA Engineering (General). Civil engineering (General) (501)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (39)
  - TE Highway engineering. Roads and pavements (4)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (2)
  - TH Building construction (51)
  - TJ Mechanical engineering and machinery (363)
  - TK Electrical engineering. Electronics Nuclear engineering (114)
  - TL Motor vehicles. Aeronautics. Astronautics (61)
  - TN Mining engineering. Metallurgy (15)
  - TP Chemical technology (23)
  - TR Photography (15)
  - TS Manufactures (331)
  - TT Handicrafts Arts and crafts (8)
  - TX Home economics (56)
- U Military Science (80)
  - U Military Science (General) (80)
- V Naval Science (216)
  - V Naval Science (General) (168)
  - VM Naval architecture. Shipbuilding. Marine engineering (178)
- Z Bibliography. Library Science. Information Resources (349)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (107)
  - Z719 Libraries (General) (144)
  - ZA Information resources (131)
    - ZA4050 Electronic information resources (70)
    - ZA4450 Databases (51)