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Library of Congress Subject Areas (7816)
- A General Works (1885)
  - AC Collections. Series. Collected works (301)
  - AI Indexes (General) (1598)
  - AM Museums (General). Collectors and collecting (General) (6)
- B Philosophy. Psychology. Religion (230)
  - B Philosophy (General) (2)
  - BC Logic (2)
  - BF Psychology (212)
  - BJ Ethics (14)
  - BL Religion (1)
  - BP Islam. Bahaism. Theosophy, etc (1)
- G Geography. Anthropology. Recreation (151)
  - G Geography (General) (1)
  - GB Physical geography (4)
  - GE Environmental Sciences (130)
  - GV Recreation Leisure (16)
- H Social Sciences (254)
  - H Social Sciences (General) (2)
  - HA Statistics (31)
  - HB Economic Theory (32)
  - HC Economic History and Conditions (7)
  - HD Industries. Land use. Labor (76)
    - HD28 Management. Industrial Management (76)
  - HG Finance (9)
  - HQ The family. Marriage. Woman (7)
  - HV Social pathology. Social and public welfare (104)
- L Education (263)
  - L Education (General) (212)
  - LB Theory and practice of education (54)
    - LB1501 Primary Education (7)
    - LB1603 Secondary Education. High schools (4)
    - LB2300 Higher Education (25)
    - LB2361 Curriculum (1)
- Q Science (558)
  - Q Science (General) (26)
  - QA Mathematics (19)
    - QA75 Electronic computers. Computer science (17)
    - QA76 Computer software (2)
  - QD Chemistry (25)
  - QH Natural history (105)
    - QH301 Biology (57)
    - QH426 Genetics (61)
  - QK Botany (33)
  - QL Zoology (113)
  - QM Human anatomy (47)
  - QP Physiology (62)
  - QR Microbiology (213)
    - QR180 Immunology (59)
    - QR355 Virology (41)
- R Medicine (5985)
  - R Medicine (General) (3324)
  - RA Public aspects of medicine (841)
    - RA0421 Public health. Hygiene. Preventive Medicine (516)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (35)
  - RB Pathology (40)
  - RC Internal medicine (784)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (213)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (261)
    - RC1200 Sports Medicine (5)
  - RD Surgery (140)
  - RE Ophthalmology (14)
  - RF Otorhinolaryngology (19)
  - RG Gynecology and obstetrics (232)
  - RJ Pediatrics (296)
    - RJ101 Child Health. Child health services (25)
  - RK Dentistry (618)
  - RL Dermatology (118)
  - RM Therapeutics. Pharmacology (630)
  - RS Pharmacy and materia medica (590)
  - RT Nursing (342)
  - RV Botanic, Thomsonian, and eclectic medicine (130)
  - RZ Other systems of medicine (208)
- S Agriculture (4)
  - SB Plant culture (2)
  - SF Animal culture (2)
- T Technology (42)
  - T Technology (General) (8)
    - T201 Patents. Trademarks (1)
  - TC Hydraulic engineering. Ocean engineering (1)
  - TD Environmental technology. Sanitary engineering (30)
  - TH Building construction (4)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
- Z Bibliography. Library Science. Information Resources (104)
  - Z004 Books. Writing. Paleography (34)
  - Z665 Library Science. Information Science (63)
  - Z719 Libraries (General) (34)
  - ZA Information resources (80)
    - ZA4050 Electronic information resources (67)
    - ZA4450 Databases (41)