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Library of Congress Subject Areas (29)
- A General Works (9)
  - AC Collections. Series. Collected works (8)
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- H Social Sciences (2)
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- S Agriculture (4)
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  - SF Animal culture (3)
- T Technology (6)
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  - TD Environmental technology. Sanitary engineering (1)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (2)
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