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Library of Congress Subject Areas (6171)
- A General Works (54)
  - AC Collections. Series. Collected works (44)
    - AC1-195 Collections of Monographs, Essays, etc. (10)
  - AN Newspapers (General) (9)
  - AS Academies and learned societies (General) (2)
- B Philosophy. Psychology. Religion (36)
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- C Auxiliary Sciences of History (1)
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- G Geography. Anthropology. Recreation (29)
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    - GV1-1860 Recreation. Leisure (1)
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- H Social Sciences (1373)
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  - HB Economic theory. Demography (85)
    - HB172.5 Macroeconomics (1)
    - HB522-715 Income. Factor shares (8)
      - HB615-715 Entrepreneurship. Risk and uncertainty. Property (8)
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  - HC Economic History and Conditions (52)
    - HC79 Special Topics. Including air pollution, automation, consumer demand, famines, flow of funds, etc. (32)
  - HD Industries. Land use. Labor (511)
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      - HD30.23 Decision making (6)
      - HD38.5 Business logistics (3)
      - HD49-49.5 Crisis management. Emergency management. Inflation (1)
      - HD53 Intellectual work. Intellectual capital (6)
      - HD57.7 Leadership (4)
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      - HD60-60.5 Social responsibility of business (1)
      - HD61 Risk in industry. Risk management (40)
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      - HD69 Other Including business consultants, capacity, size of industries, etc. (3)
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        HD2741 Holding companies. Corporate governance (4)
        HD2744 Corporations—Investor relations (2)
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        HF5548.32-.34 Electronic commerce (5)
      - HF5548.7-5548.85 Industrial psychology (35)
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      - HF5601-5689 Accounting. Bookkeeping (16)
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      - HQ793-799.2 Youth. Adolescents. Teenagers (1)
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  - H1-99 Social Sciences (General) (93)
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- J Political Science (11)
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- K Law (23)
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- L Education (604)
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- M Music and Books on Music (1)
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- N Fine Arts (76)
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- Q Science (1810)
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    - QA71-90 Instruments and machines (1190)
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      - QA75.5-76.95 Electronic computers. Computer science (1188)
        QA76.75-76.765 Computer software (180)
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    - QC170-197 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics (2)
    - QC251-338.5 Heat (1)
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    - QC474-496.9 Radiation physics (General) (1)
    - QC501-766 Electricity and magnetism (2)
      - QC501-(721) Electricity (2)
        QC717.6-718.8 Plasma physics. Ionized gases (2)
- R Medicine (65)
  - R Medicine (General) (24)
    - R856-857 Biomedical engineering. Electronics. Instrumentation (1)
    - R858-859.7 Computer applications to medicine. Medical informatics (2)
  - RA Public aspects of medicine (19)
    - RA0421 Public health. Hygiene. Preventive Medicine (14)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RC Internal medicine (10)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
    - RC1200 Sports Medicine (1)
    - RC71-78.7 Examination. Diagnosis (3)
  - RD Surgery (1)
  - RG Gynecology and obstetrics (4)
    - RG491 Diseases of the Breast (4)
  - RM Therapeutics. Pharmacology (3)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (1)
- S Agriculture (5)
  - S Agriculture (General) (1)
  - SB Plant culture (1)
  - SF Animal culture (3)
    - SF951 Diseases of Special Classes of Animals (2)
- T Technology (2706)
  - T Technology (General) (1268)
    - T201 Patents. Trademarks (1)
    - T351 Mechanical drawing. Engineering graphics (13)
  - TA Engineering (General). Civil engineering (General) (752)
    - TA1501-1820 Applied optics. Photonics (40)
    - TA164 Bioengineering (1)
    - TA165 Engineering instruments, meters, etc. Industrial instrumentation (2)
    - TA166-167 Human engineering (1)
    - TA401-492 Materials of engineering and construction. Mechanics of materials (6)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (9)
    - TD878-894 Special types of environment Including soil pollution, air pollution, noise pollution (1)
  - TE Highway engineering. Roads and pavements (2)
  - TH Building construction (3)
  - TJ Mechanical Engineering and Machinery (66)
    - TJ181-210 Mechanical movements (1)
    - TJ210.2-211.47 Mechanical devices and figures. Automata. Ingenious mechanisms. Robots (General) (11)
    - TJ212-225 Control engineering systems. Automatic machinery (General) (4)
    - TJ255-265 Heat engines (2)
    - TJ807-830 Renewable energy sources (1)
    - TJ836-927 Hydraulic machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (616)
    - TK1001-1841 Production of electric energy or power. Powerplants. Central stations (2)
    - TK2000-2891 Dynamoelectric machinery and auxiliaries (1)
    - TK3001-3521 Distribution or transmission of electric power (1)
    - TK452-454.4 Electric apparatus and materials. Electric circuits. Electric networks (3)
    - TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television (247)
    - TK7800-8360 Electronics (182)
      - TK7871 Electronics--Materials (10)
      - TK7885-7895 Computer engineering. Computer hardware (6)
        TK7895.M4 Memory systems (3)
      - TK8300-8360 Photoelectronic devices (General) (3)
  - TL Motor vehicles. Aeronautics. Astronautics (6)
  - TN Mining engineering. Metallurgy (1)
    - TN600-799 Metallurgy (1)
  - TP Chemical technology (22)
    - TP1080-1185 Polymers and polymer manufacture (2)
  - TR Photography (11)
    - TR624-835 Applied photography Including artistic, commercial, medical photography, photocopying processes (1)
    - TR845-899 Cinematography. Motion pictures (4)
  - TS Manufactures (27)
    - TS155-194 Production management. Operations management (3)
    - TS200-770 Metal manufactures. Metalworking (1)
      - TS695 Chemical vapor deposition (1)
  - TT Handicrafts Arts and crafts (1)
  - TX Home economics (20)
    - TX301-339 The house Including arrangement, care, servants (1)
- U Military Science (1)
  - U Military Science (General) (1)
- Z Bibliography. Library Science. Information Resources (20)
  - Z004 Books. Writing. Paleography (6)
  - Z665 Library Science. Information Science (4)
  - Z719 Libraries (General) (2)
  - ZA3038-5190 Information resources (General) (8)
    - ZA4050-4775 Information in specific formats or media (3)
      - ZA4050-4480 Electronic information resources (2)
      - ZA4550-4575 Motion pictures. Video recordings (1)