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Library of Congress Subject Areas (8595)
- A General Works (4)
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- B Philosophy. Psychology. Religion (129)
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- R Medicine (129)
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- S Agriculture (23)
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- T Technology (5297)
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  - TA Engineering (General). Civil engineering (General) (1154)
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    - TA401-492 Materials of engineering and construction. Mechanics of materials (523)
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    - TA703-711 Engineering geology. Rock mechanics. Soil mechanics. (118)
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  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (406)
    - TD1-157 Environmental technology. Sanitary engineering (13)
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    - TD169-171 Environmental protection. Environmental geotechnology (17)
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    - TD201-500 Water supply for domestic and industrial purposes (108)
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    - TD785-812 Municipal refuse. Solid wastes (56)
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    - TD881-890 Air pollution and its control (41)
    - TD891-894 Noise and its control (36)
    - TD895-899 Industrial and factory sanitation (14)
    - TD920-931 Rural and farm sanitary engineering (4)
  - TE Highway engineering. Roads and pavements (59)
  - TF Railroad engineering and operation (27)
  - TG Bridge engineering (3)
  - TH Building construction (305)
    - TH1-844 Building construction (117)
    - TH1000-1727 Systems of building construction (33)
    - TH2025 Details in building design and construction (15)
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    - TH5011-5701 Construction by phase of the work (Building trades) (1)
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    - TH6014-6085 Environmental engineering of buildings. Sanitary engineering of buildings (5)
    - TH7005-7699 Heating and ventilation. Air conditioning (53)
    - TH7700-7975 Illumination. Lighting (3)
    - TH845-895 Architectural engineering. Structural engineering of buildings (15)
    - TH9025-9092 Protection of buildings (3)
    - TH9701-9745 Protection from burglary, sabotage, etc. Security in buildings (1)
  - TJ Mechanical engineering and machinery (702)
    - TJ1-162 Mechanical engineering and machinery (62)
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    - TJ163-163.12 Mechanical and electrical engineering combined (13)
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    - TJ255-265 Heat engines (58)
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    - TJ751-805 Miscellaneous motors and engines (50)
    - TJ807-830 Renewable energy sources (39)
    - TJ836-935 Hydraulic machinery (29)
    - TJ950-1030 Pneumatic machinery (3)
  - TK Electrical engineering. Electronics Nuclear engineering (1301)
    - TK1-300 Electrical engineering. Electronics. Nuclear engineering (32)
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    - TK3001-3521 Distribution or transmission of electric power (111)
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    - TK5101-5865 Telecommunication. Telegraph. (226)
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    - TK6600 Phototelegraphy. Picture telegraphy (4)
    - TK6630-6687 Television. Digital video (7)
    - TK7018-7725 Installation of household appliances (2)
    - TK7800-8360 Electronics (409)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (135)
    - TL1-484 Motor vehicles. Cycles (74)
    - TL500-778 Aeronautics. Aeronautical engineering (33)
    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (35)
  - TP Chemical technology (333)
    - TP1-154 Chemical technology (9)
    - TP1080-1185 Polymers and polymer manufacture (71)
    - TP155-156 Chemical engineering (28)
    - TP157-159 Apparatus and supplies (20)
    - TP250-261 Industrial electrochemistry (24)
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    - TP315-360 Fuel (73)
    - TP363 Heating, drying, cooling, evaporating (8)
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    - TP489-498 Low temperature engineering. Cryogenic engineering. Refrigeration. Ice cutting and storage (4)
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    - TP875-888 Cement industries (1)
    - TP890-933 Textile bleaching, dyeing, printing, etc. (2)
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    - TP950-994 Miscellaneous organic chemical industries (3)
    - TP995-996 Utilization of wastes (15)
  - TR Photography (5)
  - TS Manufactures (302)
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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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