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Library of Congress Subject Areas (1604)
- A General Works (51)
  - AC Collections. Series. Collected works (27)
  - AI Indexes (General) (10)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (18)
  - AZ History of Scholarship The Humanities (13)
- B Philosophy. Psychology. Religion (4)
  - B Philosophy (General) (1)
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  - BT Doctrinal Theology (1)
  - BV Practical Theology (2)
    - BV1460 Religious Education (1)
  - BX Christian Denominations (1)
- C Auxiliary Sciences of History (3)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (2)
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  - CD Diplomatics. Archives. Seals (3)
    - CD921 Archives (2)
  - CE Technical chronology. Calendar (2)
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  - CN Inscriptions. Epigraphy. (2)
  - CR Heraldry (2)
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- D History General and Old World (1)
  - D History (General) (1)
- E History America (2)
  - E11 America (General) (1)
  - E151 United States (General) (1)
- F History United States, Canada, Latin America (3)
  - F001 United States local history (3)
- G Geography. Anthropology. Recreation (7)
  - G Geography (General) (3)
  - GC Oceanography (1)
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- H Social Sciences (665)
  - H Social Sciences (General) (141)
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  - HB Economic Theory (344)
  - HC Economic History and Conditions (150)
  - HD Industries. Land use. Labor (51)
    - HD28 Management. Industrial Management (43)
    - HD61 Risk Management (22)
  - HE Transportation and Communications (7)
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    - HF5601 Accounting (11)
  - HG Finance (110)
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  - HM Sociology (42)
  - HN Social history and conditions. Social problems. Social reform (44)
  - HQ The family. Marriage. Woman (3)
  - HS Societies secret benevolent etc (3)
  - HT Communities. Classes. Races (5)
  - HV Social pathology. Social and public welfare (30)
  - HX Socialism. Communism. Anarchism (4)
- J Political Science (93)
  - J General legislative and executive papers (14)
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  - JC Political theory (31)
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- K Law (198)
  - K Law (General) (184)
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    - KDC Scotland (2)
  - KF United States Federal Law (50)
  - KZ Law of Nations (22)
- L Education (324)
  - L Education (General) (251)
  - LA History of education (30)
  - LB Theory and practice of education (122)
    - LB1501 Primary Education (59)
    - LB1603 Secondary Education. High schools (2)
    - LB2300 Higher Education (8)
    - LB2361 Curriculum (11)
  - LC Special aspects of education (13)
    - LC5201 Education extension. Adult education. Continuing education (2)
  - LD Individual institutions (United States) (3)
  - LE Individual institutions (America except United States) (1)
  - LF Individual institutions (Europe) (2)
  - LG Individual institutions (Asia. Africa) (4)
  - LT Textbooks (5)
- M Music and Books on Music (2)
  - M Music (1)
  - MT Musical instruction and study (1)
- N Fine Arts (2)
  - N Visual arts (General) For photography, see TR (1)
  - NE Print media (1)
- P Language and Literature (105)
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  - PE English (78)
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  - PN Literature (General) (17)
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  - PR English literature (21)
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- Q Science (69)
  - Q Science (General) (44)
  - QA Mathematics (5)
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  - QH Natural history (6)
    - QH301 Biology (3)
  - QK Botany (4)
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- R Medicine (5)
  - R Medicine (General) (2)
  - RA Public aspects of medicine (2)
  - RD Surgery (1)
  - RG Gynecology and obstetrics (2)
  - RS Pharmacy and materia medica (1)
- S Agriculture (154)
  - S Agriculture (General) (148)
  - SB Plant culture (25)
  - SD Forestry (3)
  - SF Animal culture (6)
  - SH Aquaculture. Fisheries. Angling (5)
- T Technology (23)
  - T Technology (General) (12)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (2)
  - TC Hydraulic engineering. Ocean engineering (6)
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  - TE Highway engineering. Roads and pavements (2)
  - TF Railroad engineering and operation (1)
  - TG Bridge engineering (1)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (2)
  - TK Electrical engineering. Electronics Nuclear engineering (2)
  - TL Motor vehicles. Aeronautics. Astronautics (1)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (2)
  - TR Photography (1)
  - TX Home economics (4)
- U Military Science (1)
  - U Military Science (General) (1)
- V Naval Science (17)
  - V Naval Science (General) (15)
  - VM Naval architecture. Shipbuilding. Marine engineering (2)
- Z Bibliography. Library Science. Information Resources (7)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (4)
  - Z719 Libraries (General) (4)
  - ZA Information resources (5)
    - ZA4050 Electronic information resources (3)
    - ZA4450 Databases (4)