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Library of Congress Subject Areas (4663)
- A General Works (95)
  - AC Collections. Series. Collected works (62)
  - AI Indexes (General) (10)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (26)
  - AZ History of Scholarship The Humanities (4)
- B Philosophy. Psychology. Religion (96)
  - B Philosophy (General) (8)
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- C Auxiliary Sciences of History (4)
  - C Auxiliary sciences of history (General) (3)
  - CC Archaeology (1)
- D History General and Old World (3)
  - D History (General) (2)
  - DJ Netherlands (Holland) (1)
- E History America (1)
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- G Geography. Anthropology. Recreation (9)
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- H Social Sciences (43)
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  - HN Social history and conditions. Social problems. Social reform (4)
  - HQ The family. Marriage. Woman (5)
  - HT Communities. Classes. Races (4)
  - HV Social pathology. Social and public welfare (2)
- K Law (17)
  - K Law (General) (17)
- L Education (565)
  - L Education (General) (407)
  - LA History of education (8)
  - LB Theory and practice of education (148)
    - LB1501 Primary Education (14)
    - LB1603 Secondary Education. High schools (2)
    - LB2300 Higher Education (15)
  - LC Special aspects of education (33)
    - LC5201 Education extension. Adult education. Continuing education (4)
  - LD Individual institutions (United States) (2)
  - LG Individual institutions (Asia. Africa) (4)
- M Music and Books on Music (3)
  - M Music (3)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (6)
  - PK Indo-Iranian (1)
  - PN Literature (General) (4)
  - PR English literature (1)
- Q Science (329)
  - Q Science (General) (102)
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    - QA75 Electronic computers. Computer science (1)
  - QC Physics (4)
  - QD Chemistry (33)
  - QH Natural history (69)
    - QH301 Biology (61)
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  - QK Botany (4)
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  - QM Human anatomy (13)
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  - QR Microbiology (108)
    - QR180 Immunology (11)
    - QR355 Virology (10)
- R Medicine (4006)
  - R Medicine (General) (646)
  - RA Public aspects of medicine (653)
    - RA0421 Public health. Hygiene. Preventive Medicine (578)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (103)
  - RC Internal medicine (361)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (2)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (2)
    - RC1200 Sports Medicine (1)
  - RD Surgery (58)
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  - RG Gynecology and obstetrics (773)
  - RJ Pediatrics (422)
    - RJ101 Child Health. Child health services (66)
  - RK Dentistry (975)
  - RL Dermatology (5)
  - RM Therapeutics. Pharmacology (39)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (953)
  - RV Botanic, Thomsonian, and eclectic medicine (5)
  - RX Homeopathy (6)
  - RZ Other systems of medicine (75)
- S Agriculture (11)
  - S Agriculture (General) (8)
  - SB Plant culture (3)
- T Technology (69)
  - T Technology (General) (7)
  - TD Environmental technology. Sanitary engineering (45)
  - TP Chemical technology (16)
  - TR Photography (2)
- Z Bibliography. Library Science. Information Resources (113)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (15)
  - Z719 Libraries (General) (55)
  - ZA Information resources (44)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (37)