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Library of Congress Subject Areas (8648)
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- T Technology (5346)
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  - TC Hydraulic engineering. Ocean engineering (58)
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    - TD895-899 Industrial and factory sanitation (15)
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  - TE Highway engineering. Roads and pavements (60)
  - TF Railroad engineering and operation (27)
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  - TH Building construction (311)
    - TH1-844 Building construction (119)
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    - TH9025-9092 Protection of buildings (4)
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  - TJ Mechanical engineering and machinery (706)
    - TJ1-162 Mechanical engineering and machinery (62)
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  - TK Electrical engineering. Electronics Nuclear engineering (1322)
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    - TK7018-7725 Installation of household appliances (2)
    - TK7800-8360 Electronics (418)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (135)
    - TL1-484 Motor vehicles. Cycles (74)
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    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (35)
  - TP Chemical technology (334)
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  - TR Photography (5)
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- U Military Science (2)
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