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Library of Congress Subject Areas (20516)
- A General Works (205)
  - AC Collections. Series. Collected works (60)
  - AI Indexes (General) (46)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (112)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (248)
  - B Philosophy (General) (14)
  - BC Logic (2)
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  - BL Religion (49)
  - BP Islam. Bahaism. Theosophy, etc (57)
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- C Auxiliary Sciences of History (21)
  - CB History of civilization (2)
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- D History General and Old World (33)
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    - D839 Post-war History, 1945 on (1)
    - D880 Developing Countries (6)
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- E History America (31)
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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 (86)
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- H Social Sciences (7843)
  - H Social Sciences (General) (2432)
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  - HB Economic Theory (1900)
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    - HD28 Management. Industrial Management (899)
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- J Political Science (1489)
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- K Law (2600)
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- L Education (964)
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    - LB1501 Primary Education (36)
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    - LB2361 Curriculum (4)
  - LC Special aspects of education (23)
    - LC5201 Education extension. Adult education. Continuing education (14)
  - LD Individual institutions (United States) (3)
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  - LG Individual institutions (Asia. Africa) (10)
  - LT Textbooks (13)
- M Music and Books on Music (49)
  - M Music (40)
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  - MT Musical instruction and study (5)
- N Fine Arts (69)
  - N Visual arts (General) For photography, see TR (32)
  - NA Architecture (3)
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- P Language and Literature (47)
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- Q Science (2618)
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  - QH Natural history (42)
    - QH301 Biology (34)
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  - QM Human anatomy (142)
  - QP Physiology (200)
  - QR Microbiology (59)
    - QR180 Immunology (11)
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- R Medicine (5067)
  - R Medicine (General) (2407)
  - RA Public aspects of medicine (1233)
    - RA0421 Public health. Hygiene. Preventive Medicine (1005)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (5)
  - RB Pathology (221)
  - RC Internal medicine (195)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (25)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (45)
    - RC1200 Sports Medicine (41)
  - RD Surgery (67)
  - RE Ophthalmology (17)
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  - RG Gynecology and obstetrics (146)
  - RJ Pediatrics (234)
    - RJ101 Child Health. Child health services (117)
  - RK Dentistry (8)
  - RL Dermatology (36)
  - RM Therapeutics. Pharmacology (279)
  - RS Pharmacy and materia medica (169)
  - RT Nursing (1561)
  - RV Botanic, Thomsonian, and eclectic medicine (68)
  - RX Homeopathy (10)
  - RZ Other systems of medicine (364)
- S Agriculture (77)
  - S Agriculture (General) (57)
  - SB Plant culture (8)
  - SD Forestry (8)
  - SF Animal culture (3)
  - SH Aquaculture. Fisheries. Angling (7)
- T Technology (1974)
  - T Technology (General) (910)
    - T201 Patents. Trademarks (8)
  - TA Engineering (General). Civil engineering (General) (501)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (41)
  - TE Highway engineering. Roads and pavements (4)
  - TF Railroad engineering and operation (6)
  - TG Bridge engineering (2)
  - TH Building construction (51)
  - TJ Mechanical engineering and machinery (365)
  - TK Electrical engineering. Electronics Nuclear engineering (114)
  - TL Motor vehicles. Aeronautics. Astronautics (62)
  - TN Mining engineering. Metallurgy (15)
  - TP Chemical technology (24)
  - TR Photography (15)
  - TS Manufactures (333)
  - TT Handicrafts Arts and crafts (8)
  - TX Home economics (57)
- U Military Science (84)
  - U Military Science (General) (84)
- V Naval Science (217)
  - V Naval Science (General) (169)
  - VM Naval architecture. Shipbuilding. Marine engineering (178)
- Z Bibliography. Library Science. Information Resources (355)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (107)
  - Z719 Libraries (General) (146)
  - ZA Information resources (137)
    - ZA4050 Electronic information resources (72)
    - ZA4450 Databases (53)