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Library of Congress Subject Areas (633)
- A General Works (12)
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  - AI Indexes (General) (1)
  - AS Academies and learned societies (General) (6)
- B Philosophy. Psychology. Religion (11)
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- C Auxiliary Sciences of History (8)
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- D History General and Old World (13)
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- G Geography. Anthropology. Recreation (4)
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- H Social Sciences (167)
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- K Law (2)
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- L Education (59)
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  - LC Special aspects of education (15)
    - LC5201 Education extension. Adult education. Continuing education (4)
- M Music and Books on Music (1)
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- N Fine Arts (45)
  - N Visual arts (General) For photography, see TR (2)
  - NA Architecture (6)
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- Q Science (71)
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- R Medicine (13)
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- T Technology (420)
  - T Technology (General) (122)
  - TA Engineering (General). Civil engineering (General) (102)
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  - TJ Mechanical engineering and machinery (139)
  - TK Electrical engineering. Electronics Nuclear engineering (75)
  - TL Motor vehicles. Aeronautics. Astronautics (34)
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  - TP Chemical technology (4)
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- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (2)
  - Z004 Books. Writing. Paleography (1)
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    - ZA4050 Electronic information resources (1)