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Library of Congress Subject Areas (1777)
- A General Works (37)
  - AC Collections. Series. Collected works (2)
  - AI Indexes (General) (29)
  - AS Academies and learned societies (General) (7)
- C Auxiliary Sciences of History (1)
  - CB History of civilization (1)
- G Geography. Anthropology. Recreation (5)
  - G Geography (General) (2)
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  - GE Environmental Sciences (1)
  - GF Human ecology. Anthropogeography (1)
  - GV Recreation Leisure (1)
- H Social Sciences (525)
  - H Social Sciences (General) (226)
  - HA Statistics (35)
  - HB Economic Theory (257)
  - HC Economic History and Conditions (84)
  - HD Industries. Land use. Labor (41)
    - HD28 Management. Industrial Management (31)
    - HD61 Risk Management (1)
  - HE Transportation and Communications (7)
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    - HF5601 Accounting (12)
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  - HN Social history and conditions. Social problems. Social reform (15)
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  - HV Social pathology. Social and public welfare (3)
- J Political Science (5)
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  - JS Local government Municipal government (3)
- K Law (613)
  - K Law (General) (612)
  - KZ Law of Nations (12)
- L Education (89)
  - L Education (General) (66)
  - LA History of education (1)
  - LB Theory and practice of education (31)
    - LB1501 Primary Education (31)
  - LG Individual institutions (Asia. Africa) (1)
- Q Science (107)
  - Q Science (General) (50)
  - QA Mathematics (54)
    - QA75 Electronic computers. Computer science (51)
    - QA76 Computer software (20)
  - QD Chemistry (2)
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  - QM Human anatomy (1)
- R Medicine (3)
  - R Medicine (General) (1)
  - RA Public aspects of medicine (2)
    - RA0421 Public health. Hygiene. Preventive Medicine (2)
- S Agriculture (4)
  - S Agriculture (General) (1)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (3)
- T Technology (500)
  - T Technology (General) (204)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (297)
  - TC Hydraulic engineering. Ocean engineering (2)
  - TD Environmental technology. Sanitary engineering (52)
  - TE Highway engineering. Roads and pavements (53)
  - TF Railroad engineering and operation (18)
  - TG Bridge engineering (9)
  - TH Building construction (76)
  - TJ Mechanical engineering and machinery (4)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TP Chemical technology (1)
  - TS Manufactures (1)
- Z Bibliography. Library Science. Information Resources (2)
  - Z719 Libraries (General) (1)
  - ZA Information resources (1)
    - ZA4050 Electronic information resources (1)