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Library of Congress Subject Areas (9703)
- A General Works (6)
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- B Philosophy. Psychology. Religion (137)
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- R Medicine (143)
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- T Technology (5864)
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  - TA Engineering (General). Civil engineering (General) (1298)
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    - TA630-695 Structural engineering (General) (152)
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  - TC Hydraulic engineering. Ocean engineering (65)
  - TD Environmental technology. Sanitary engineering (507)
    - TD1-157 Environmental technology. Sanitary engineering (19)
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    - TD878-880 Soil pollution. Soil remediation (19)
    - TD881-890 Air pollution and its control (45)
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    - TD895-899 Industrial and factory sanitation (15)
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  - TE Highway engineering. Roads and pavements (70)
  - TF Railroad engineering and operation (29)
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  - TH Building construction (370)
    - TH1-844 Building construction (133)
    - TH1000-1727 Systems of building construction (37)
    - TH2025 Details in building design and construction (15)
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    - TH5011-5701 Construction by phase of the work (Building trades) (1)
    - TH6010-6013 Building fittings and their installation (1)
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    - TH7005-7699 Heating and ventilation. Air conditioning (60)
    - TH7700-7975 Illumination. Lighting (4)
    - TH845-895 Architectural engineering. Structural engineering of buildings (35)
    - TH9025-9092 Protection of buildings (5)
    - TH9111-9599 Protection from fire. Fire prevention and extinction (1)
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  - TJ Mechanical engineering and machinery (725)
    - TJ1-162 Mechanical engineering and machinery (63)
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    - TJ163-163.12 Mechanical and electrical engineering combined (13)
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    - TJ807-830 Renewable energy sources (40)
    - TJ836-935 Hydraulic machinery (30)
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  - TK Electrical engineering. Electronics Nuclear engineering (1402)
    - TK1-300 Electrical engineering. Electronics. Nuclear engineering (32)
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    - TK5101-5865 Telecommunication. Telegraph. (243)
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    - TK7800-8360 Electronics (446)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (136)
    - TL1-484 Motor vehicles. Cycles (75)
    - TL500-778 Aeronautics. Aeronautical engineering (33)
    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (35)
  - TP Chemical technology (394)
    - TP1-154 Chemical technology (10)
    - TP1080-1185 Polymers and polymer manufacture (84)
    - TP155-156 Chemical engineering (31)
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    - TP995-996 Utilization of wastes (17)
  - TR Photography (5)
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  - TT Handicrafts Arts and crafts (3)
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- U Military Science (2)
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