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Library of Congress Subject Areas (2235)
- A General Works (37)
  - AC Collections. Series. Collected works (2)
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  - AS Academies and learned societies (General) (7)
- C Auxiliary Sciences of History (1)
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- G Geography. Anthropology. Recreation (5)
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- H Social Sciences (670)
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  - HB Economic Theory (294)
  - HC Economic History and Conditions (84)
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- K Law (817)
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- L Education (102)
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    - LB1501 Primary Education (42)
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- Q Science (107)
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    - QA75 Electronic computers. Computer science (51)
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- R Medicine (3)
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    - RA0421 Public health. Hygiene. Preventive Medicine (2)
- S Agriculture (4)
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  - SH Aquaculture. Fisheries. Angling (3)
- T Technology (596)
  - T Technology (General) (248)
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  - TA Engineering (General). Civil engineering (General) (342)
  - TC Hydraulic engineering. Ocean engineering (2)
  - TD Environmental technology. Sanitary engineering (53)
  - TE Highway engineering. Roads and pavements (53)
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  - TH Building construction (81)
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  - TL Motor vehicles. Aeronautics. Astronautics (2)
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