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Library of Congress Subject Areas (6)
- A General Works (69)
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  - AI Indexes (General) (69)
  - AM Museums (General). Collectors and collecting (General) (6)
  - AS Academies and learned societies (General) (113)
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- B Philosophy. Psychology. Religion (1)
  - B Philosophy (General) (67)
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    - BV1460 Religious Education (21)
- C Auxiliary Sciences of History (1)
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- E History America (7)
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- G Geography. Anthropology. Recreation (7)
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- L Education (93)
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- M Music and Books on Music (58)
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- N Fine Arts (4)
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- Q Science (4)
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- R Medicine (27)
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  - RB Pathology (37)
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  - RM Therapeutics. Pharmacology (106)
  - RS Pharmacy and materia medica (203)
  - RT Nursing (720)
  - RV Botanic, Thomsonian, and eclectic medicine (19)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (92)
- S Agriculture (190)
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  - SF Animal culture (190)
  - SH Aquaculture. Fisheries. Angling (94)
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- T Technology (72)
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  - TA Engineering (General). Civil engineering (General) (404)
  - TC Hydraulic engineering. Ocean engineering (22)
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  - TE Highway engineering. Roads and pavements (37)
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  - TH Building construction (72)
  - TJ Mechanical engineering and machinery (92)
  - TK Electrical engineering. Electronics Nuclear engineering (256)
  - TL Motor vehicles. Aeronautics. Astronautics (12)
  - TN Mining engineering. Metallurgy (3)
  - TP Chemical technology (21)
  - TR Photography (10)
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  - TT Handicrafts Arts and crafts (13)
  - TX Home economics (31)
- U Military Science (39)
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- V Naval Science (2)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (59)
  - Z004 Books. Writing. Paleography (20)
  - Z665 Library Science. Information Science (53)
  - Z719 Libraries (General) (39)
  - ZA Information resources (59)
    - ZA4050 Electronic information resources (23)
    - ZA4450 Databases (17)