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Library of Congress Subject Areas (6820)
- B Philosophy. Psychology. Religion (91)
  - BF Psychology (50)
    - BF501-505 Motivation (8)
    - BF511-593 Affection. Feeling. Emotion (17)
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- C Auxiliary Sciences of History (1)
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- D History General and Old World (36)
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- G Geography. Anthropology. Recreation (91)
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- H Social Sciences (701)
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- K Law (2)
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- L Education (1037)
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  - LC Special aspects of education (199)
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- M Music and Books on Music (6)
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- N Fine Arts (8)
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- P Language and Literature (24)
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- Q Science (631)
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- R Medicine (74)
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- S Agriculture (13)
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- T Technology (4216)
  - T Technology (General) (240)
    - T201 Patents. Trademarks (1)
  - T55-55.3 Industrial safety. Industrial accident prevention (26)
  - T55.4-60.8 Industrial engineering. Management engineering (13)
  - T58.5-58.64 Information technology (27)
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  - TA Engineering (General). Civil engineering (General) (916)
    - TA1-163 Engineering (General). Civil engineering (General) (26)
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    - TA164 Bioengineering (5)
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    - TA166-167 Human engineering (4)
    - TA170-171 Environmental engineering (7)
    - TA174 Engineering design (18)
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    - TA329-348 Engineering mathematics. Engineering analysis (17)
    - TA349-359 Mechanics of engineering. Applied mechanics (58)
    - TA365-367 Acoustics in engineering. Acoustical engineering (12)
    - TA401-492 Materials of engineering and construction. Mechanics of materials (387)
    - TA495 Disasters and engineering (2)
    - TA501-625 Surveying (14)
    - TA630-695 Structural engineering (General) (126)
    - TA703-711 Engineering geology. Rock mechanics. Soil mechanics. (99)
    - TA715-787 Earthwork. Foundations (8)
    - TA800-820 Tunneling. Tunnels (1)
  - TC Hydraulic engineering. Ocean engineering (42)
  - TD Environmental technology. Sanitary engineering (303)
    - TD1-157 Environmental technology. Sanitary engineering (11)
    - TD1020-1066 Hazardous substances and their disposal (2)
    - TD1067-9999 Hazardous substances and their disposal (2)
    - TD169-171 Environmental protection. Environmental geotechnology (11)
    - TD172-193 Environmental pollution (15)
    - TD194-196 Environmental effects of industries and plants. Special environmental pollutants (12)
    - TD201-500 Water supply for domestic and industrial purposes (58)
    - TD511-780 Sewage collection and disposal systems. Sewerage (35)
    - TD785-812 Municipal refuse. Solid wastes (41)
    - TD878-880 Soil pollution. Soil remediation (10)
    - TD881-890 Air pollution and its control (36)
    - TD891-894 Noise and its control (33)
    - TD895-899 Industrial and factory sanitation (11)
    - TD920-931 Rural and farm sanitary engineering (4)
  - TE Highway engineering. Roads and pavements (47)
  - TF Railroad engineering and operation (25)
  - TG Bridge engineering (3)
  - TH Building construction (231)
    - TH1-844 Building construction (78)
    - TH1000-1727 Systems of building construction (21)
    - 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 (44)
    - 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 (615)
    - TJ1-162 Mechanical engineering and machinery (51)
    - TJ1040-1119 Machinery exclusive of prime movers (24)
    - TJ1125-1345 Machine shops and machine shop practice (64)
    - 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)
    - TJ165 Energy storage (2)
    - TJ166 Safety measures and devices (3)
    - TJ170-179 Mechanics applied to machinery. Dynamics (17)
    - TJ181-210.1 Mechanical movements (13)
    - TJ210.2-211 Mechanical devices and figures. Automata. Ingenious mechanisms. (73)
    - TJ212-225 Control engineering systems. Automatic machinery (General) (71)
    - TJ227-240 Machine design and drawing (3)
    - TJ241-254.4 Machine construction (General) (8)
    - TJ255-265 Heat engines (56)
    - TJ266-267 Turbines. Turbomachines (General) (3)
    - TJ268-740 Steam engineering (2)
    - TJ751-805 Miscellaneous motors and engines (42)
    - TJ807-830 Renewable energy sources (29)
    - TJ836-935 Hydraulic machinery (23)
    - TJ950-1030 Pneumatic machinery (3)
  - TK Electrical engineering. Electronics Nuclear engineering (1115)
    - TK1-300 Electrical engineering. Electronics. Nuclear engineering (29)
    - TK1001-1841 Production of electric energy or power. Powerplants. Central stations (113)
    - TK2000-2891 Dynamoelectric machinery and auxiliaries (134)
    - TK2896-2986 Production of electricity by direct energy conversion (21)
    - TK3001-3521 Distribution or transmission of electric power (95)
    - TK301-399 Electric meters. Telemeter systems (1)
    - TK4001-4102 Applications of electric power (9)
    - TK411-415 Electrical engineering and testing laboratories (4)
    - TK4125-4399 Electric lighting (2)
    - TK435 Estimates (1)
    - TK441-448 Management and superintendence of electrical enterprises (1)
    - TK452-454 Electric apparatus and materials. Electric circuits. Electric networks (9)
    - TK4601-4661 Electric heating (7)
    - TK5101-5865 Telecommunication. Telegraph. (191)
    - TK6540-6571 Radio (34)
    - TK6573-6595 Radar (16)
    - TK6600 Phototelegraphy. Picture telegraphy (1)
    - TK6630-6687 Television. Digital video (4)
    - TK7018-7725 Installation of household appliances (2)
    - TK7800-8360 Electronics (351)
    - TK9001-9401 Nuclear engineering. Atomic power (1)
  - TL Motor vehicles. Aeronautics. Astronautics (118)
    - TL1-484 Motor vehicles. Cycles (58)
    - TL500-778 Aeronautics. Aeronautical engineering (32)
    - TL787-4050 Astronautics. Space travel (1)
  - TN Mining engineering. Metallurgy (31)
  - TP Chemical technology (251)
    - TP1-154 Chemical technology (5)
    - TP1080-1185 Polymers and polymer manufacture (45)
    - TP155-156 Chemical engineering (23)
    - TP157-159 Apparatus and supplies (17)
    - TP250-261 Industrial electrochemistry (16)
    - TP315-360 Fuel (63)
    - TP363 Heating, drying, cooling, evaporating (8)
    - TP368-456 Food processing and manufacture (6)
    - TP489-498 Low temperature engineering. Cryogenic engineering. Refrigeration. Ice cutting and storage (4)
    - TP670-699 Oils, fats, and waxes (3)
    - TP751-762 Gas industry (3)
    - TP785-869 Clay industries. Ceramics. Glass (12)
    - TP875-888 Cement industries (1)
    - TP890-933 Textile bleaching, dyeing, printing, etc. (2)
    - TP934-945 Paints, pigments, varnishes, etc. (1)
    - TP950-994 Miscellaneous organic chemical industries (2)
    - TP995-996 Utilization of wastes (7)
  - TR Photography (5)
  - TS Manufactures (228)
    - TS1-154 Manufactures (19)
    - TS1080-1268 Paper manufacture and trade (11)
    - TS1300-1865 Textile industries (6)
    - TS155-194 Production management. Operations management (120)
    - TS1870-1935 Rubber industry (1)
    - TS195-198 Packaging (1)
    - TS1950-2301 Miscellaneous industries (1)
    - TS200-770 Metal manufactures. Metalworking (43)
    - TS800-937 Wood technology. Lumber (2)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (10)
- U Military Science (2)
  - U Military Science (General) (2)
- V Naval Science (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (32)
  - Z004 Books. Writing. Paleography (9)
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  - Z719 Libraries (General) (4)
  - ZA Information resources (8)
    - ZA4050 Electronic information resources (5)
    - ZA4450 Databases (1)