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Library of Congress Subject Areas (7233)
- B Philosophy. Psychology. Religion (104)
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- R Medicine (88)
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- S Agriculture (19)
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- T Technology (4445)
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  - TA Engineering (General). Civil engineering (General) (970)
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    - TA401-492 Materials of engineering and construction. Mechanics of materials (417)
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    - TA630-695 Structural engineering (General) (127)
    - TA703-711 Engineering geology. Rock mechanics. Soil mechanics. (107)
    - TA715-787 Earthwork. Foundations (8)
    - TA800-820 Tunneling. Tunnels (1)
  - TC Hydraulic engineering. Ocean engineering (48)
  - TD Environmental technology. Sanitary engineering (328)
    - TD1-157 Environmental technology. Sanitary engineering (11)
    - TD1020-1066 Hazardous substances and their disposal (2)
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    - TD169-171 Environmental protection. Environmental geotechnology (12)
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    - TD194-196 Environmental effects of industries and plants. Special environmental pollutants (12)
    - TD201-500 Water supply for domestic and industrial purposes (64)
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    - TD785-812 Municipal refuse. Solid wastes (46)
    - TD878-880 Soil pollution. Soil remediation (11)
    - TD881-890 Air pollution and its control (39)
    - TD891-894 Noise and its control (34)
    - TD895-899 Industrial and factory sanitation (12)
    - TD920-931 Rural and farm sanitary engineering (4)
  - TE Highway engineering. Roads and pavements (49)
  - TF Railroad engineering and operation (25)
  - TG Bridge engineering (3)
  - TH Building construction (252)
    - TH1-844 Building construction (90)
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    - TH2025 Details in building design and construction (15)
    - TH3301-3411 Maintenance and repair (22)
    - TH5011-5701 Construction by phase of the work (Building trades) (1)
    - TH6010-6013 Building fittings and their installation (1)
    - TH6014-6085 Environmental engineering of buildings. Sanitary engineering of buildings (5)
    - TH7005-7699 Heating and ventilation. Air conditioning (49)
    - TH7700-7975 Illumination. Lighting (2)
    - TH845-895 Architectural engineering. Structural engineering of buildings (10)
    - TH9025-9092 Protection of buildings (2)
  - TJ Mechanical engineering and machinery (638)
    - TJ1-162 Mechanical engineering and machinery (51)
    - TJ1040-1119 Machinery exclusive of prime movers (25)
    - TJ1125-1345 Machine shops and machine shop practice (66)
    - TJ1350-1418 Hoisting and conveying machinery (1)
    - TJ1530-1570 Other special machinery (2)
    - TJ163-163.12 Mechanical and electrical engineering combined (13)
    - TJ164 Power plants (General) (1)
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    - TJ166 Safety measures and devices (3)
    - TJ170-179 Mechanics applied to machinery. Dynamics (17)
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    - TJ210.2-211 Mechanical devices and figures. Automata. Ingenious mechanisms. (75)
    - TJ212-225 Control engineering systems. Automatic machinery (General) (73)
    - TJ227-240 Machine design and drawing (3)
    - TJ241-254.4 Machine construction (General) (9)
    - TJ255-265 Heat engines (58)
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    - TJ751-805 Miscellaneous motors and engines (46)
    - TJ807-830 Renewable energy sources (30)
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  - TK Electrical engineering. Electronics Nuclear engineering (1166)
    - TK1-300 Electrical engineering. Electronics. Nuclear engineering (30)
    - TK1001-1841 Production of electric energy or power. Powerplants. Central stations (116)
    - TK2000-2891 Dynamoelectric machinery and auxiliaries (140)
    - TK2896-2986 Production of electricity by direct energy conversion (24)
    - TK3001-3521 Distribution or transmission of electric power (97)
    - TK301-399 Electric meters. Telemeter systems (1)
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    - TK411-415 Electrical engineering and testing laboratories (4)
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    - TK435 Estimates (1)
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    - TK452-454 Electric apparatus and materials. Electric circuits. Electric networks (10)
    - TK4601-4661 Electric heating (7)
    - TK5101-5865 Telecommunication. Telegraph. (196)
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    - TK6600 Phototelegraphy. Picture telegraphy (1)
    - TK6630-6687 Television. Digital video (5)
    - TK7018-7725 Installation of household appliances (2)
    - TK7800-8360 Electronics (374)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (124)
    - TL1-484 Motor vehicles. Cycles (63)
    - TL500-778 Aeronautics. Aeronautical engineering (33)
    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (32)
  - TP Chemical technology (274)
    - TP1-154 Chemical technology (7)
    - TP1080-1185 Polymers and polymer manufacture (51)
    - TP155-156 Chemical engineering (26)
    - TP157-159 Apparatus and supplies (17)
    - TP250-261 Industrial electrochemistry (18)
    - TP315-360 Fuel (66)
    - TP363 Heating, drying, cooling, evaporating (8)
    - TP368-456 Food processing and manufacture (7)
    - TP489-498 Low temperature engineering. Cryogenic engineering. Refrigeration. Ice cutting and storage (4)
    - TP670-699 Oils, fats, and waxes (4)
    - TP751-762 Gas industry (4)
    - TP785-869 Clay industries. Ceramics. Glass (14)
    - TP875-888 Cement industries (1)
    - TP890-933 Textile bleaching, dyeing, printing, etc. (2)
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    - TP950-994 Miscellaneous organic chemical industries (2)
    - TP995-996 Utilization of wastes (8)
  - TR Photography (5)
  - TS Manufactures (239)
    - TS1-154 Manufactures (20)
    - TS1080-1268 Paper manufacture and trade (11)
    - TS1300-1865 Textile industries (6)
    - TS155-194 Production management. Operations management (125)
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    - TS200-770 Metal manufactures. Metalworking (48)
    - TS800-937 Wood technology. Lumber (2)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (10)
- 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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