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Library of Congress Subject Areas (5049)
- A General Works (152)
  - AC Collections. Series. Collected works (116)
  - AI Indexes (General) (11)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (27)
  - AZ History of Scholarship The Humanities (5)
- B Philosophy. Psychology. Religion (111)
  - B Philosophy (General) (10)
  - BC Logic (2)
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  - BH Aesthetics (1)
  - BJ Ethics (1)
  - BL Religion (4)
  - BV Practical Theology (2)
- C Auxiliary Sciences of History (4)
  - C Auxiliary sciences of history (General) (3)
  - CC Archaeology (1)
- D History General and Old World (5)
  - D History (General) (4)
  - DJ Netherlands (Holland) (1)
- E History America (1)
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- G Geography. Anthropology. Recreation (9)
  - G Geography (General) (1)
  - GA Mathematical geography. Cartography (2)
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  - GV Recreation Leisure (1)
- H Social Sciences (52)
  - H Social Sciences (General) (32)
  - HN Social history and conditions. Social problems. Social reform (6)
  - HQ The family. Marriage. Woman (6)
  - HT Communities. Classes. Races (8)
  - HV Social pathology. Social and public welfare (2)
- K Law (17)
  - K Law (General) (17)
- L Education (667)
  - L Education (General) (482)
  - LA History of education (12)
  - LB Theory and practice of education (176)
    - LB1501 Primary Education (17)
    - LB1603 Secondary Education. High schools (3)
    - LB2300 Higher Education (15)
  - LC Special aspects of education (37)
    - LC5201 Education extension. Adult education. Continuing education (4)
  - LD Individual institutions (United States) (2)
  - LG Individual institutions (Asia. Africa) (5)
- M Music and Books on Music (5)
  - M Music (4)
  - MT Musical instruction and study (1)
- N Fine Arts (1)
  - N Visual arts (General) For photography, see TR (1)
- P Language and Literature (10)
  - PK Indo-Iranian (1)
  - PN Literature (General) (8)
  - PR English literature (1)
- Q Science (373)
  - Q Science (General) (120)
  - QA Mathematics (2)
    - QA75 Electronic computers. Computer science (1)
  - QC Physics (7)
  - QD Chemistry (36)
  - QH Natural history (82)
    - QH301 Biology (71)
    - QH426 Genetics (3)
  - QK Botany (7)
  - QL Zoology (3)
  - QM Human anatomy (19)
  - QP Physiology (13)
  - QR Microbiology (115)
    - QR180 Immunology (12)
    - QR355 Virology (10)
- R Medicine (4292)
  - R Medicine (General) (711)
  - RA Public aspects of medicine (689)
    - RA0421 Public health. Hygiene. Preventive Medicine (605)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (1)
  - RB Pathology (110)
  - RC Internal medicine (412)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (4)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (3)
    - RC1200 Sports Medicine (1)
  - RD Surgery (66)
  - RF Otorhinolaryngology (1)
  - RG Gynecology and obstetrics (815)
  - RJ Pediatrics (444)
    - RJ101 Child Health. Child health services (73)
  - RK Dentistry (1048)
  - RL Dermatology (6)
  - RM Therapeutics. Pharmacology (57)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (1085)
  - RV Botanic, Thomsonian, and eclectic medicine (7)
  - RX Homeopathy (7)
  - RZ Other systems of medicine (81)
- S Agriculture (17)
  - S Agriculture (General) (12)
  - SB Plant culture (5)
- T Technology (74)
  - T Technology (General) (10)
    - T201 Patents. Trademarks (1)
  - TD Environmental technology. Sanitary engineering (45)
  - TP Chemical technology (18)
  - TR Photography (2)
- Z Bibliography. Library Science. Information Resources (140)
  - Z004 Books. Writing. Paleography (5)
  - Z665 Library Science. Information Science (27)
  - Z719 Libraries (General) (62)
  - ZA Information resources (55)
    - ZA4050 Electronic information resources (3)
    - ZA4450 Databases (37)