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Library of Congress Subject Areas (33)
- A General Works (9)
  - AC Collections. Series. Collected works (23)
  - AI Indexes (General) (47)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (42)
  - AZ History of Scholarship The Humanities (9)
- B Philosophy. Psychology. Religion (3)
  - B Philosophy (General) (3)
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  - BQ Buddhism (1)
- C Auxiliary Sciences of History (2)
  - C Auxiliary sciences of history (General) (1)
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- D History General and Old World (2)
  - D History (General) (2)
    - D051 Ancient History (2)
    - D839 Post-war History, 1945 on (1)
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- G Geography. Anthropology. Recreation (22)
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- H Social Sciences (47)
  - H Social Sciences (General) (97)
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  - HB Economic Theory (109)
  - HC Economic History and Conditions (29)
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    - HD28 Management. Industrial Management (45)
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  - HE Transportation and Communications (13)
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  - HN Social history and conditions. Social problems. Social reform (37)
  - HQ The family. Marriage. Woman (4)
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  - HT Communities. Classes. Races (5)
  - HV Social pathology. Social and public welfare (11)
  - HX Socialism. Communism. Anarchism (4)
- J Political Science (30)
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- K Law (1)
  - K Law (General) (1)
- L Education (1)
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    - LB1501 Primary Education (10)
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    - LB2300 Higher Education (2)
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  - LC Special aspects of education (2)
    - LC5201 Education extension. Adult education. Continuing education (2)
  - LE Individual institutions (America except United States) (1)
  - LG Individual institutions (Asia. Africa) (1)
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- N Fine Arts (5)
  - N Visual arts (General) For photography, see TR (31)
  - NA Architecture (33)
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  - NX Arts in general (8)
- P Language and Literature (7)
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- Q Science (117)
  - Q Science (General) (50)
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    - QA75 Electronic computers. Computer science (104)
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  - QC Physics (1)
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- R Medicine (6)
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    - RA0421 Public health. Hygiene. Preventive Medicine (2)
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  - RJ Pediatrics (1)
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  - RS Pharmacy and materia medica (1)
  - RZ Other systems of medicine (6)
- S Agriculture (3)
  - S Agriculture (General) (15)
  - SB Plant culture (10)
  - SD Forestry (1)
  - SF Animal culture (3)
  - SH Aquaculture. Fisheries. Angling (1)
- T Technology (10)
  - T Technology (General) (167)
    - T201 Patents. Trademarks (6)
  - TA Engineering (General). Civil engineering (General) (145)
  - TC Hydraulic engineering. Ocean engineering (2)
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  - TP Chemical technology (2)
  - TR Photography (2)
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  - TX Home economics (5)
- U Military Science (2)
  - U Military Science (General) (2)
- Z Bibliography. Library Science. Information Resources (33)
  - Z004 Books. Writing. Paleography (4)
  - Z665 Library Science. Information Science (26)
  - Z719 Libraries (General) (3)
  - ZA Information resources (33)
    - ZA4050 Electronic information resources (12)
    - ZA4450 Databases (18)