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Library of Congress Subject Areas (16116)
- 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 (1201)
  - B Philosophy (General) (89)
  - BC Logic (6)
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  - BL Religion (44)
  - BM Judaism (6)
  - BP Islam. Bahaism. Theosophy, etc (16)
  - BR Christianity (4)
  - BV Practical Theology (4)
    - BV1460 Religious Education (3)
- C Auxiliary Sciences of History (23)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (2)
  - CC Archaeology (6)
  - CD Diplomatics. Archives. Seals (5)
    - CD921 Archives (1)
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- D History General and Old World (233)
  - D History (General) (88)
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    - D839 Post-war History, 1945 on (3)
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    - D901 Europe (General) (6)
  - DA Great Britain (83)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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    - DJK Eastern Europe (3)
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- E History America (14)
  - E11 America (General) (6)
  - E151 United States (General) (9)
- F History United States, Canada, Latin America (4)
  - F001 United States local history (2)
  - F1201 Latin America (General) (2)
- G Geography. Anthropology. Recreation (792)
  - G Geography (General) (58)
  - GA Mathematical geography. Cartography (5)
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  - GC Oceanography (6)
  - GE Environmental Sciences (345)
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- H Social Sciences (3534)
  - H Social Sciences (General) (784)
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  - HQ The family. Marriage. Woman (79)
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  - HV Social pathology. Social and public welfare (150)
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- J Political Science (152)
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- K Law (653)
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- L Education (1218)
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  - LB Theory and practice of education (812)
    - LB1501 Primary Education (101)
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    - LB2300 Higher Education (346)
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  - LC Special aspects of education (146)
    - LC5201 Education extension. Adult education. Continuing education (58)
  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (103)
  - M Music (82)
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  - MT Musical instruction and study (19)
- N Fine Arts (600)
  - N Visual arts (General) For photography, see TR (209)
  - NA Architecture (313)
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  - NX Arts in general (88)
- P Language and Literature (754)
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  - PN Literature (General) (449)
    - PN0080 Criticism (82)
    - PN0441 Literary History (10)
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    - PN2000 Dramatic representation. The Theater (106)
  - PQ Romance literatures (8)
  - PR English literature (130)
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  - PT Germanic literature (2)
  - PZ Childrens literature (8)
- Q Science (4230)
  - Q Science (General) (414)
  - QA Mathematics (2496)
    - QA75 Electronic computers. Computer science (979)
    - QA76 Computer software (637)
  - QB Astronomy (1)
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  - QH Natural history (213)
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  - QL Zoology (139)
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  - QR Microbiology (93)
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    - QR355 Virology (23)
- R Medicine (1645)
  - R Medicine (General) (323)
  - RA Public aspects of medicine (358)
    - RA0421 Public health. Hygiene. Preventive Medicine (218)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (14)
  - RC Internal medicine (218)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (53)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (30)
    - RC1200 Sports Medicine (61)
  - RD Surgery (12)
  - RE Ophthalmology (14)
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  - RG Gynecology and obstetrics (42)
  - RJ Pediatrics (42)
    - RJ101 Child Health. Child health services (24)
  - RK Dentistry (55)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (175)
  - RS Pharmacy and materia medica (266)
  - RT Nursing (314)
  - RV Botanic, Thomsonian, and eclectic medicine (14)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (56)
- S Agriculture (1661)
  - S Agriculture (General) (1317)
  - SB Plant culture (496)
  - SD Forestry (45)
  - SF Animal culture (83)
  - SH Aquaculture. Fisheries. Angling (57)
- T Technology (2821)
  - T Technology (General) (594)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1093)
  - TC Hydraulic engineering. Ocean engineering (21)
  - TD Environmental technology. Sanitary engineering (217)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (7)
  - TH Building construction (170)
  - TJ Mechanical engineering and machinery (145)
  - TK Electrical engineering. Electronics Nuclear engineering (568)
  - TL Motor vehicles. Aeronautics. Astronautics (96)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (153)
  - TR Photography (22)
  - TS Manufactures (138)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (10)
  - U Military Science (General) (10)
- V Naval Science (71)
  - V Naval Science (General) (21)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (116)
  - Z004 Books. Writing. Paleography (72)
  - Z665 Library Science. Information Science (20)
  - Z719 Libraries (General) (4)
  - ZA Information resources (24)
    - ZA4050 Electronic information resources (15)
    - ZA4450 Databases (5)