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Library of Congress Subject Areas (10037)
- A General Works (19)
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- R Medicine (156)
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- T Technology (6087)
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  - TA Engineering (General). Civil engineering (General) (1310)
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  - TC Hydraulic engineering. Ocean engineering (65)
  - TD Environmental technology. Sanitary engineering (514)
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    - 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 (71)
  - TF Railroad engineering and operation (29)
  - TG Bridge engineering (3)
  - TH Building construction (373)
    - TH1-844 Building construction (134)
    - TH1000-1727 Systems of building construction (38)
    - TH2025 Details in building design and construction (16)
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    - TH5011-5701 Construction by phase of the work (Building trades) (1)
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    - TH845-895 Architectural engineering. Structural engineering of buildings (35)
    - TH9025-9092 Protection of buildings (5)
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  - TJ Mechanical engineering and machinery (729)
    - TJ1-162 Mechanical engineering and machinery (65)
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    - TJ163-163.12 Mechanical and electrical engineering combined (13)
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    - TJ212-225 Control engineering systems. Automatic machinery (General) (81)
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  - TK Electrical engineering. Electronics Nuclear engineering (1436)
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    - TK435 Estimates (1)
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    - TK5101-5865 Telecommunication. Telegraph. (250)
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    - TK7800-8360 Electronics (451)
    - TK9001-9401 Nuclear engineering. Atomic power (2)
  - 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 (407)
    - TP1-154 Chemical technology (12)
    - TP1080-1185 Polymers and polymer manufacture (84)
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    - TP157-159 Apparatus and supplies (20)
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    - TP950-994 Miscellaneous organic chemical industries (3)
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  - 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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- V Naval Science (4)
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