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Library of Congress Subject Areas (23546)
- A General Works (134)
  - AC Collections. Series. Collected works (41)
  - AI Indexes (General) (41)
  - AM Museums (General). Collectors and collecting (General) (6)
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- B Philosophy. Psychology. Religion (65)
  - B Philosophy (General) (5)
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- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (1)
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    - CD921 Archives (1)
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- D History General and Old World (11)
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- E History America (2)
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- F History United States, Canada, Latin America (1)
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- G Geography. Anthropology. Recreation (80)
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- H Social Sciences (7955)
  - H Social Sciences (General) (1800)
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  - HD Industries. Land use. Labor (1099)
    - HD1401 Agriculture-Economic aspects (122)
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- J Political Science (1217)
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- L Education (956)
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- M Music and Books on Music (23)
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- N Fine Arts (1362)
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  - NA Architecture (530)
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- P Language and Literature (489)
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- Q Science (1947)
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  - QB Astronomy (1)
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- R Medicine (38)
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    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
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    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (1)
  - RE Ophthalmology (1)
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    - RJ101 Child Health. Child health services (1)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (2)
  - RS Pharmacy and materia medica (2)
  - RZ Other systems of medicine (2)
- S Agriculture (1970)
  - S Agriculture (General) (1684)
    - S590-599.9 Soils. Soil science (231)
    - S631-667 Fertilizers and Improvement of the soil (188)
  - SB Plant culture (358)
    - SB599-990.5 Pests and Diseases (101)
    - SB950-989 Pest Control and Treatment of Diseases, Plant Protection (174)
  - SD Forestry (44)
  - SF Animal culture (28)
  - SH Aquaculture. Fisheries. Angling (33)
  - SK Hunting sports (2)
- T Technology (7601)
  - T Technology (General) (2763)
    - T55.4-60.8 Industrial engineering. Management engineering (708)
    - T201 Patents. Trademarks (8)
    - T385 Computer Graphics (151)
    - T58.6-58.62 Management Information Systems (747)
  - TA Engineering (General). Civil engineering (General) (805)
  - TC Hydraulic engineering. Ocean engineering (14)
  - TD Environmental technology. Sanitary engineering (1237)
  - TE Highway engineering. Roads and pavements (72)
  - TF Railroad engineering and operation (16)
  - TG Bridge engineering (14)
  - TH Building construction (99)
  - TJ Mechanical engineering and machinery (143)
  - TK Electrical engineering. Electronics Nuclear engineering (138)
    - TK5105 Computer Network (61)
    - TK5105.882 Internet (49)
    - TK5105.888 World Wild Web (52)
  - TL Motor vehicles. Aeronautics. Astronautics (8)
  - TN Mining engineering. Metallurgy (11)
  - TP Chemical technology (2517)
    - TP155 Chemical engineering (1921)
    - TP368 Food processing and manufacture (442)
    - TP500 Fermentation industries. Beverages. Alcohol (19)
  - TR Photography (24)
  - TS Manufactures (373)
    - TS 155-194 Production Management, Operations Management (266)
    - TS 180-TS180.8 Material Handling (30)
  - TT Handicrafts Arts and crafts (14)
  - TX Home economics (23)
- U Military Science (14)
  - U Military Science (General) (14)
- V Naval Science (10)
  - V Naval Science (General) (3)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (97)
  - Z004 Books. Writing. Paleography (6)
  - Z665 Library Science. Information Science (48)
  - Z719 Libraries (General) (14)
  - ZA Information resources (40)
    - ZA4050 Electronic information resources (16)
    - ZA4450 Databases (21)