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Library of Congress Subject Areas (7106)
- B Philosophy. Psychology. Religion (96)
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- T Technology (4376)
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  - TC Hydraulic engineering. Ocean engineering (47)
  - TD Environmental technology. Sanitary engineering (324)
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    - TD881-890 Air pollution and its control (38)
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  - TE Highway engineering. Roads and pavements (47)
  - TF Railroad engineering and operation (25)
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  - TH Building construction (249)
    - TH1-844 Building construction (90)
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    - TH845-895 Architectural engineering. Structural engineering of buildings (10)
    - TH9025-9092 Protection of buildings (2)
  - TJ Mechanical engineering and machinery (629)
    - TJ1-162 Mechanical engineering and machinery (51)
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    - TJ163-163.12 Mechanical and electrical engineering combined (13)
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    - TJ170-179 Mechanics applied to machinery. Dynamics (17)
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    - TJ210.2-211 Mechanical devices and figures. Automata. Ingenious mechanisms. (73)
    - TJ212-225 Control engineering systems. Automatic machinery (General) (73)
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  - TK Electrical engineering. Electronics Nuclear engineering (1145)
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    - TK7018-7725 Installation of household appliances (2)
    - TK7800-8360 Electronics (369)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (124)
    - TL1-484 Motor vehicles. Cycles (63)
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    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (32)
  - TP Chemical technology (267)
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  - TR Photography (5)
  - TS Manufactures (237)
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    - TS1300-1865 Textile industries (6)
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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 (3)
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- Z Bibliography. Library Science. Information Resources (33)
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