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Library of Congress Subject Areas (4624)
- B Philosophy. Psychology. Religion (34)
  - B Philosophy (General) (7)
  - BF Psychology (18)
  - BJ Ethics (8)
  - BL Religion (4)
  - BQ Buddhism (1)
- G Geography. Anthropology. Recreation (61)
  - G Geography (General) (2)
  - GE Environmental Sciences (52)
  - GF Human ecology. Anthropogeography (4)
  - GN Anthropology (1)
  - GT Manners and customs (2)
- H Social Sciences (481)
  - H Social Sciences (General) (171)
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  - HB Economic Theory (15)
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  - HD Industries. Land use. Labor (137)
    - HD28 Management. Industrial Management (119)
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  - HQ The family. Marriage. Woman (4)
  - HT Communities. Classes. Races (17)
  - HV Social pathology. Social and public welfare (9)
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- J Political Science (41)
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- K Law (11)
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- L Education (154)
  - L Education (General) (153)
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    - LC5201 Education extension. Adult education. Continuing education (1)
- M Music and Books on Music (4)
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- N Fine Arts (3)
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- P Language and Literature (9)
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- Q Science (4146)
  - Q Science (General) (4137)
  - QA Mathematics (130)
    - QA75 Electronic computers. Computer science (87)
    - QA76 Computer software (94)
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  - QH Natural history (11)
    - QH301 Biology (9)
    - QH426 Genetics (2)
  - QK Botany (27)
  - QL Zoology (14)
  - QM Human anatomy (1)
  - QR Microbiology (63)
    - QR180 Immunology (12)
    - QR355 Virology (2)
- R Medicine (504)
  - R Medicine (General) (180)
  - RA Public aspects of medicine (64)
    - RA0421 Public health. Hygiene. Preventive Medicine (28)
  - RB Pathology (22)
  - RC Internal medicine (75)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (44)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (27)
    - RC1200 Sports Medicine (2)
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  - RE Ophthalmology (7)
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  - RG Gynecology and obstetrics (42)
  - RH Orthopedics and Physiotherapy (6)
  - RJ Pediatrics (39)
    - RJ101 Child Health. Child health services (25)
  - RK Dentistry (35)
  - RL Dermatology (13)
  - RM Therapeutics. Pharmacology (16)
  - RS Pharmacy and materia medica (12)
  - RT Nursing (52)
  - RV Botanic, Thomsonian, and eclectic medicine (9)
  - RX Homeopathy (3)
  - RZ Other systems of medicine (18)
- S Agriculture (64)
  - S Agriculture (General) (50)
  - SB Plant culture (3)
  - SF Animal culture (13)
  - SH Aquaculture. Fisheries. Angling (2)
- T Technology (1265)
  - Engineering and Technology (1128)
  - T Technology (General) (71)
  - TA Engineering (General) (1161)
  - TC Hydraulic engineering. Ocean engineering (3)
  - TD Environmental technology. Sanitary engineering (19)
  - TE Highway engineering. Roads and pavements (1)
  - TH Building construction (7)
  - TJ Mechanical engineering and machinery (2)
  - TK Electrical engineering. Electronics Nuclear engineering (10)
  - TL Motor vehicles. Aeronautics. Astronautics (11)
  - TN Mining engineering. Metallurgy (1)
  - TP Chemical technology (20)
  - TR Photography (2)
  - TS Manufactures (9)
- U Military Science (5)
  - U Military Science (General) (5)
- V Naval Science (1)
  - V Naval Science (General) (1)
  - VM Naval architecture. Shipbuilding. Marine engineering (1)
- Z Bibliography. Library Science. Information Resources (5)
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