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Library of Congress Subject Areas (12558)
- A General Works (6)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (798)
  - B Philosophy (General) (83)
  - BC Logic (6)
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    - BV1460 Religious Education (2)
- C Auxiliary Sciences of History (23)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
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- D History General and Old World (208)
  - D History (General) (73)
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    - D839 Post-war History, 1945 on (3)
    - D901 Europe (General) (4)
  - DA Great Britain (73)
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  - DE The Mediterranean Region. The Greco-Roman World (4)
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- E History America (13)
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  - E151 United States (General) (8)
- F History United States, Canada, Latin America (3)
  - F001 United States local history (2)
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- G Geography. Anthropology. Recreation (640)
  - G Geography (General) (53)
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- H Social Sciences (2652)
  - H Social Sciences (General) (305)
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- J Political Science (127)
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- K Law (422)
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- L Education (901)
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    - LB1501 Primary Education (85)
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    - LB2300 Higher Education (237)
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  - LC Special aspects of education (134)
    - LC5201 Education extension. Adult education. Continuing education (50)
  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (61)
  - M Music (51)
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  - MT Musical instruction and study (8)
- N Fine Arts (477)
  - N Visual arts (General) For photography, see TR (157)
  - NA Architecture (268)
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  - NX Arts in general (63)
- P Language and Literature (680)
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  - PN Literature (General) (408)
    - PN0080 Criticism (82)
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    - PN2000 Dramatic representation. The Theater (89)
  - PQ Romance literatures (4)
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  - PZ Childrens literature (8)
- Q Science (3665)
  - Q Science (General) (292)
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    - QA75 Electronic computers. Computer science (776)
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  - QC Physics (290)
  - QD Chemistry (703)
  - QE Geology (52)
  - QH Natural history (161)
    - QH301 Biology (83)
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  - QP Physiology (192)
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    - QR355 Virology (22)
- R Medicine (1412)
  - R Medicine (General) (221)
  - RA Public aspects of medicine (310)
    - RA0421 Public health. Hygiene. Preventive Medicine (174)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (11)
  - RC Internal medicine (201)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (50)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (28)
    - RC1200 Sports Medicine (48)
  - RD Surgery (7)
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    - RJ101 Child Health. Child health services (23)
  - RK Dentistry (54)
  - RL Dermatology (4)
  - RM Therapeutics. Pharmacology (170)
  - RS Pharmacy and materia medica (257)
  - RT Nursing (280)
  - RV Botanic, Thomsonian, and eclectic medicine (13)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (49)
- S Agriculture (1246)
  - S Agriculture (General) (947)
  - SB Plant culture (468)
  - SD Forestry (42)
  - SF Animal culture (67)
  - SH Aquaculture. Fisheries. Angling (45)
- T Technology (2449)
  - T Technology (General) (581)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (817)
  - TC Hydraulic engineering. Ocean engineering (20)
  - TD Environmental technology. Sanitary engineering (199)
  - TE Highway engineering. Roads and pavements (6)
  - TF Railroad engineering and operation (13)
  - TG Bridge engineering (7)
  - TH Building construction (138)
  - TJ Mechanical engineering and machinery (138)
  - TK Electrical engineering. Electronics Nuclear engineering (550)
  - TL Motor vehicles. Aeronautics. Astronautics (92)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (149)
  - TR Photography (18)
  - TS Manufactures (130)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (19)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (69)
  - V Naval Science (General) (20)
  - VM Naval architecture. Shipbuilding. Marine engineering (51)
- Z Bibliography. Library Science. Information Resources (105)
  - Z004 Books. Writing. Paleography (73)
  - Z665 Library Science. Information Science (16)
  - Z719 Libraries (General) (3)
  - ZA Information resources (16)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (2)