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Library of Congress Subject Areas (1861)
- A General Works (5)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (2)
- B Philosophy. Psychology. Religion (187)
  - B Philosophy (General) (9)
  - BF Psychology (165)
  - BJ Ethics (5)
  - BL Religion (5)
  - BM Judaism (4)
  - BR Christianity (1)
- D History General and Old World (11)
  - D History (General) (7)
    - D204 Modern History (1)
    - D839 Post-war History, 1945 on (1)
    - D901 Europe (General) (3)
  - DA Great Britain (2)
  - DS Asia (3)
- E History America (2)
  - E11 America (General) (1)
  - E151 United States (General) (1)
- F History United States, Canada, Latin America (2)
  - F001 United States local history (2)
- G Geography. Anthropology. Recreation (117)
  - G Geography (General) (41)
  - GB Physical geography (2)
  - GC Oceanography (2)
  - GE Environmental Sciences (34)
  - GF Human ecology. Anthropogeography (4)
  - GN Anthropology (9)
  - GV Recreation Leisure (42)
- H Social Sciences (303)
  - H Social Sciences (General) (125)
  - HB Economic Theory (9)
  - HD Industries. Land use. Labor (69)
    - HD28 Management. Industrial Management (58)
    - HD61 Risk Management (7)
  - HE Transportation and Communications (15)
  - HF Commerce (5)
    - HF5601 Accounting (2)
  - HG Finance (8)
  - HJ Public Finance (1)
  - HM Sociology (22)
  - HN Social history and conditions. Social problems. Social reform (12)
  - HQ The family. Marriage. Woman (12)
  - HT Communities. Classes. Races (51)
  - HV Social pathology. Social and public welfare (10)
- J Political Science (36)
  - J General legislative and executive papers (2)
  - JA Political science (General) (7)
  - JC Political theory (23)
  - JF Political institutions (General) (2)
  - JZ International relations (3)
- K Law (31)
  - K Law (General) (24)
  - KD England and Wales (8)
- L Education (326)
  - L Education (General) (97)
  - LB Theory and practice of education (231)
    - LB1501 Primary Education (2)
    - LB1603 Secondary Education. High schools (4)
    - LB2300 Higher Education (216)
    - LB2361 Curriculum (1)
  - LC Special aspects of education (19)
    - LC5201 Education extension. Adult education. Continuing education (19)
- M Music and Books on Music (36)
  - M Music (36)
  - ML Literature of music (3)
- N Fine Arts (161)
  - N Visual arts (General) For photography, see TR (47)
  - NA Architecture (11)
  - NB Sculpture (2)
  - NC Drawing Design Illustration (2)
  - ND Painting (2)
  - NK Decorative arts Applied arts Decoration and ornament (2)
  - NX Arts in general (107)
- P Language and Literature (22)
  - P Philology. Linguistics (1)
  - PE English (1)
  - PN Literature (General) (16)
    - PN0080 Criticism (4)
    - PN1993 Motion Pictures (4)
    - PN2000 Dramatic representation. The Theater (3)
  - PR English literature (4)
  - PS American literature (3)
- Q Science (109)
  - Q Science (General) (32)
  - QA Mathematics (69)
    - QA75 Electronic computers. Computer science (52)
    - QA76 Computer software (18)
  - QD Chemistry (2)
  - QK Botany (1)
  - QM Human anatomy (5)
  - QP Physiology (6)
- R Medicine (688)
  - R Medicine (General) (181)
  - RA Public aspects of medicine (26)
    - RA0421 Public health. Hygiene. Preventive Medicine (23)
  - RB Pathology (9)
  - RC Internal medicine (144)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (7)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (14)
    - RC1200 Sports Medicine (123)
  - RD Surgery (1)
  - RE Ophthalmology (41)
  - RF Otorhinolaryngology (1)
  - RG Gynecology and obstetrics (3)
  - RJ Pediatrics (15)
    - RJ101 Child Health. Child health services (13)
  - RK Dentistry (2)
  - RM Therapeutics. Pharmacology (2)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (306)
  - RZ Other systems of medicine (12)
- S Agriculture (48)
  - S Agriculture (General) (4)
  - SB Plant culture (2)
  - SD Forestry (42)
- T Technology (126)
  - T Technology (General) (43)
  - TA Engineering (General). Civil engineering (General) (42)
  - TD Environmental technology. Sanitary engineering (7)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (33)
  - TK Electrical engineering. Electronics Nuclear engineering (9)
  - TL Motor vehicles. Aeronautics. Astronautics (2)
  - TR Photography (21)
  - TS Manufactures (37)
- U Military Science (2)
  - U Military Science (General) (2)
- Z Bibliography. Library Science. Information Resources (2)
  - Z665 Library Science. Information Science (1)
  - ZA Information resources (2)
    - ZA4050 Electronic information resources (2)