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Library of Congress Subject Areas (173)
- A General Works (71)
  - AC Collections. Series. Collected works (70)
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- D History General and Old World (1)
  - D History (General) (1)
    - D880 Developing Countries (1)
- G Geography. Anthropology. Recreation (1)
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- K Law (1)
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- L Education (35)
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- Q Science (21)
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- S Agriculture (5)
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- T Technology (42)
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