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Library of Congress Subject Areas (142)
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    - Electronics (28)
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    - Production of electric energy or power. Powerplants. Central stations (10)
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    - Metallurgy (3)
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  - TP Chemical technology (120)
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    - Animal feeds and feed mills. Pet food industry (4)
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  - TX Home economics (18)
    - Nutrition. Foods and food supply (18)
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- V Naval Science (1)
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- Veterinary Medicine (353)
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