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Library of Congress Subject Areas (17920)
- A General Works (81)
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  - AI Indexes (General) (30)
  - AM Museums (General). Collectors and collecting (General) (5)
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- B Philosophy. Psychology. Religion (39)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (5)
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- G Geography. Anthropology. Recreation (52)
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- H Social Sciences (6089)
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    - HD1401 Agriculture-Economic aspects (101)
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- M Music and Books on Music (15)
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- N Fine Arts (1028)
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- P Language and Literature (439)
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- Q Science (1445)
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- R Medicine (26)
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- S Agriculture (1442)
  - S Agriculture (General) (1233)
    - S590-599.9 Soils. Soil science (161)
    - S631-667 Fertilizers and Improvement of the soil (148)
  - SB Plant culture (254)
    - SB599-990.5 Pests and Diseases (61)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (131)
  - SD Forestry (25)
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  - SH Aquaculture. Fisheries. Angling (25)
  - SK Hunting sports (1)
- T Technology (5691)
  - T Technology (General) (2006)
    - T55.4-60.8 Industrial engineering. Management engineering (480)
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    - T385 Computer Graphics (122)
    - T58.6-58.62 Management Information Systems (581)
  - TA Engineering (General). Civil engineering (General) (649)
  - TC Hydraulic engineering. Ocean engineering (12)
  - TD Environmental technology. Sanitary engineering (922)
  - TE Highway engineering. Roads and pavements (52)
  - TF Railroad engineering and operation (9)
  - TG Bridge engineering (9)
  - TH Building construction (75)
  - TJ Mechanical engineering and machinery (58)
  - TK Electrical engineering. Electronics Nuclear engineering (111)
    - TK5105 Computer Network (46)
    - TK5105.882 Internet (41)
    - TK5105.888 World Wild Web (46)
  - TL Motor vehicles. Aeronautics. Astronautics (3)
  - TN Mining engineering. Metallurgy (7)
  - TP Chemical technology (1878)
    - TP155 Chemical engineering (1402)
    - TP368 Food processing and manufacture (340)
    - TP500 Fermentation industries. Beverages. Alcohol (16)
  - TR Photography (12)
  - TS Manufactures (259)
    - TS 155-194 Production Management, Operations Management (184)
    - TS 180-TS180.8 Material Handling (12)
  - TT Handicrafts Arts and crafts (11)
  - TX Home economics (18)
- U Military Science (8)
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- V Naval Science (7)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (5)
- Z Bibliography. Library Science. Information Resources (71)
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  - Z719 Libraries (General) (10)
  - ZA Information resources (22)
    - ZA4050 Electronic information resources (7)
    - ZA4450 Databases (12)