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Library of Congress Subject Areas (2751)
- A General Works (47)
  - AC Collections. Series. Collected works (8)
  - AI Indexes (General) (40)
  - AM Museums (General). Collectors and collecting (General) (2)
  - AS Academies and learned societies (General) (3)
- B Philosophy. Psychology. Religion (5)
  - BF Psychology (5)
- D History General and Old World (1)
  - D History (General) (1)
- G Geography. Anthropology. Recreation (1)
  - GE Environmental Sciences (1)
- H Social Sciences (70)
  - H Social Sciences (General) (48)
  - HC Economic History and Conditions (4)
  - HD Industries. Land use. Labor (5)
    - HD28 Management. Industrial Management (2)
  - HJ Public Finance (1)
  - HM Sociology (2)
  - HN Social history and conditions. Social problems. Social reform (6)
  - HQ The family. Marriage. Woman (4)
  - HT Communities. Classes. Races (2)
  - HV Social pathology. Social and public welfare (2)
- K Law (2)
  - K Law (General) (2)
- L Education (105)
  - L Education (General) (73)
  - LA History of education (3)
  - LB Theory and practice of education (28)
    - LB1501 Primary Education (5)
    - LB1603 Secondary Education. High schools (1)
    - LB2300 Higher Education (2)
  - LC Special aspects of education (3)
    - LC5201 Education extension. Adult education. Continuing education (1)
  - LD Individual institutions (United States) (2)
  - LE Individual institutions (America except United States) (1)
  - LF Individual institutions (Europe) (1)
  - LG Individual institutions (Asia. Africa) (2)
  - LT Textbooks (5)
- M Music and Books on Music (3)
  - M Music (2)
  - MT Musical instruction and study (1)
- N Fine Arts (3)
  - N Visual arts (General) For photography, see TR (3)
- P Language and Literature (9)
  - PA Classical philology (1)
  - PB Modern European Languages (1)
  - PN Literature (General) (7)
  - PR English literature (2)
- Q Science (100)
  - Q Science (General) (37)
  - QD Chemistry (7)
  - QK Botany (8)
  - QM Human anatomy (47)
  - QP Physiology (5)
  - QR Microbiology (3)
- R Medicine (2406)
  - R Medicine (General) (394)
  - RA Public aspects of medicine (165)
    - RA0421 Public health. Hygiene. Preventive Medicine (135)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (4)
  - RB Pathology (21)
  - RC Internal medicine (47)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (3)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (5)
    - RC1200 Sports Medicine (11)
  - RD Surgery (11)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (1125)
  - RJ Pediatrics (110)
    - RJ101 Child Health. Child health services (90)
  - RK Dentistry (2)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (39)
  - RS Pharmacy and materia medica (3)
  - RT Nursing (650)
  - RV Botanic, Thomsonian, and eclectic medicine (12)
  - RX Homeopathy (3)
  - RZ Other systems of medicine (104)
- S Agriculture (35)
  - S Agriculture (General) (25)
  - SB Plant culture (7)
  - SD Forestry (1)
  - SF Animal culture (3)
  - SH Aquaculture. Fisheries. Angling (10)
  - SK Hunting sports (1)
- T Technology (16)
  - T Technology (General) (6)
  - TD Environmental technology. Sanitary engineering (8)
  - TX Home economics (2)
- Z Bibliography. Library Science. Information Resources (20)
  - Z665 Library Science. Information Science (6)
  - ZA Information resources (15)
    - ZA4050 Electronic information resources (1)
    - ZA4450 Databases (13)