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Library of Congress Subject Areas (1784)
- A General Works (34)
  - AC Collections. Series. Collected works (7)
  - AI Indexes (General) (7)
  - AM Museums (General). Collectors and collecting (General) (10)
  - AS Academies and learned societies (General) (11)
  - AZ History of Scholarship The Humanities (6)
- B Philosophy. Psychology. Religion (523)
  - B Philosophy (General) (131)
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  - BT Doctrinal Theology (6)
  - BV Practical Theology (14)
    - BV1460 Religious Education (2)
  - BX Christian Denominations (15)
- C Auxiliary Sciences of History (81)
  - C Auxiliary sciences of history (General) (5)
  - CB History of civilization (25)
  - CC Archaeology (66)
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    - CD921 Archives (1)
  - CJ Numismatics (2)
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  - CT Biography (5)
- D History General and Old World (325)
  - D History (General) (139)
    - D051 Ancient History (50)
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    - D501 World War I (1)
    - D901 Europe (General) (1)
  - DA Great Britain (101)
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- E History America (6)
  - E11 America (General) (2)
  - E151 United States (General) (4)
- F History United States, Canada, Latin America (19)
  - F1001 Canada (General) (3)
  - F1201 Latin America (General) (16)
- G Geography. Anthropology. Recreation (155)
  - G Geography (General) (6)
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  - GE Environmental Sciences (50)
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- H Social Sciences (468)
  - H Social Sciences (General) (153)
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  - HD Industries. Land use. Labor (128)
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  - HQ The family. Marriage. Woman (42)
  - HT Communities. Classes. Races (32)
  - HV Social pathology. Social and public welfare (35)
  - HX Socialism. Communism. Anarchism (3)
- J Political Science (30)
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  - JV Colonies and colonization. Emigration and immigration. International migration (3)
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- K Law (20)
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- L Education (292)
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    - LB1501 Primary Education (44)
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    - LB2300 Higher Education (68)
    - LB2361 Curriculum (25)
  - LC Special aspects of education (35)
    - LC5201 Education extension. Adult education. Continuing education (12)
  - LF Individual institutions (Europe) (5)
  - LG Individual institutions (Asia. Africa) (4)
  - LT Textbooks (4)
- M Music and Books on Music (11)
  - M Music (10)
  - ML Literature of music (2)
  - MT Musical instruction and study (3)
- N Fine Arts (153)
  - N Visual arts (General) For photography, see TR (49)
  - NA Architecture (9)
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  - NX Arts in general (36)
- P Language and Literature (223)
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  - PN Literature (General) (94)
    - PN0080 Criticism (5)
    - PN0441 Literary History (8)
    - PN1993 Motion Pictures (1)
    - PN2000 Dramatic representation. The Theater (2)
  - PQ Romance literatures (3)
  - PR English literature (41)
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- Q Science (161)
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  - QA Mathematics (75)
    - QA75 Electronic computers. Computer science (58)
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  - QB Astronomy (5)
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  - QE Geology (8)
  - QH Natural history (6)
    - QH301 Biology (2)
    - QH426 Genetics (1)
  - QK Botany (7)
  - QL Zoology (11)
  - QM Human anatomy (6)
  - QP Physiology (9)
- R Medicine (137)
  - R Medicine (General) (41)
  - RA Public aspects of medicine (75)
    - RA0421 Public health. Hygiene. Preventive Medicine (54)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RC Internal medicine (12)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (4)
    - RC1200 Sports Medicine (3)
  - RE Ophthalmology (1)
  - RG Gynecology and obstetrics (2)
  - RJ Pediatrics (8)
    - RJ101 Child Health. Child health services (7)
  - RL Dermatology (3)
  - RM Therapeutics. Pharmacology (2)
  - RT Nursing (2)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RZ Other systems of medicine (2)
- S Agriculture (40)
  - S Agriculture (General) (29)
  - SB Plant culture (3)
  - SD Forestry (5)
  - SF Animal culture (9)
  - SH Aquaculture. Fisheries. Angling (6)
  - SK Hunting sports (12)
- T Technology (138)
  - T Technology (General) (64)
  - TA Engineering (General). Civil engineering (General) (16)
  - TC Hydraulic engineering. Ocean engineering (2)
  - TD Environmental technology. Sanitary engineering (3)
  - TE Highway engineering. Roads and pavements (1)
  - TF Railroad engineering and operation (1)
  - TH Building construction (6)
  - TJ Mechanical engineering and machinery (15)
  - TK Electrical engineering. Electronics Nuclear engineering (32)
  - TL Motor vehicles. Aeronautics. Astronautics (5)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (11)
  - TS Manufactures (11)
  - TT Handicrafts Arts and crafts (5)
- U Military Science (4)
  - U Military Science (General) (4)
- V Naval Science (4)
  - V Naval Science (General) (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (3)
- Z Bibliography. Library Science. Information Resources (59)
  - Z004 Books. Writing. Paleography (45)
  - Z665 Library Science. Information Science (5)
  - Z719 Libraries (General) (8)
  - ZA Information resources (8)
    - ZA4050 Electronic information resources (6)
    - ZA4450 Databases (2)