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Library of Congress Subject Areas (16066)
- A General Works (7)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1738)
  - B Philosophy (General) (26)
  - BC Logic (4)
  - BF Psychology (1654)
  - BH Aesthetics (2)
  - BJ Ethics (26)
  - BL Religion (12)
  - BM Judaism (6)
  - BP Islam. Bahaism. Theosophy, etc (6)
  - BQ Buddhism (3)
  - BR Christianity (3)
- C Auxiliary Sciences of History (4)
  - CC Archaeology (2)
  - CT Biography (1)
- D History General and Old World (167)
  - D History (General) (32)
    - D111 Medieval History (1)
    - D204 Modern History (5)
    - D501 World War I (6)
    - D731 World War II (3)
    - D839 Post-war History, 1945 on (5)
    - D901 Europe (General) (6)
  - DA Great Britain (33)
    - DAW Central Europe (4)
  - DC France (1)
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  - DE The Mediterranean Region. The Greco-Roman World (6)
  - DF Greece (6)
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    - DJK Eastern Europe (1)
  - DK Russia. Soviet Union. Former Soviet Republics (2)
  - DL Northern Europe. Scandinavia (4)
  - DP Spain (4)
  - DR Balkan Peninsula (2)
  - DS Asia (44)
  - DT Africa (32)
- E History America (25)
  - E11 America (General) (3)
  - E151 United States (General) (19)
- F History United States, Canada, Latin America (28)
  - F1001 Canada (General) (1)
  - F1201 Latin America (General) (24)
- G Geography. Anthropology. Recreation (357)
  - G Geography (General) (47)
  - GA Mathematical geography. Cartography (110)
  - GB Physical geography (24)
  - GC Oceanography (3)
  - GE Environmental Sciences (70)
  - GF Human ecology. Anthropogeography (66)
  - GN Anthropology (26)
  - GT Manners and customs (12)
  - GV Recreation Leisure (15)
- H Social Sciences (4951)
  - H Social Sciences (General) (92)
  - HA Statistics (141)
  - HB Economic Theory (689)
  - HC Economic History and Conditions (112)
  - HD Industries. Land use. Labor (1505)
    - HD28 Management. Industrial Management (762)
    - HD61 Risk Management (113)
  - HE Transportation and Communications (136)
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  - HG Finance (1185)
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  - HN Social history and conditions. Social problems. Social reform (359)
  - HQ The family. Marriage. Woman (153)
  - HS Societies secret benevolent etc (5)
  - HT Communities. Classes. Races (97)
  - HV Social pathology. Social and public welfare (185)
  - HX Socialism. Communism. Anarchism (8)
- J Political Science (776)
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  - JA Political science (General) (91)
  - JC Political theory (54)
  - JF Political institutions (General) (53)
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  - JL Political institutions (America except United States) (15)
  - JN Political institutions (Europe) (189)
    - JN101 Great Britain (49)
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  - JQ Political institutions Asia (21)
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  - JV Colonies and colonization. Emigration and immigration. International migration (90)
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- K Law (637)
  - K Law (General) (295)
  - KD England and Wales (75)
    - KDC Scotland (1)
  - KF United States Federal Law (3)
  - KZ Law of Nations (56)
- L Education (333)
  - L Education (General) (27)
  - LB Theory and practice of education (264)
    - LB1501 Primary Education (6)
    - LB1603 Secondary Education. High schools (6)
    - LB2300 Higher Education (189)
    - LB2361 Curriculum (1)
  - LC Special aspects of education (10)
    - LC5201 Education extension. Adult education. Continuing education (6)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (513)
  - M Music (307)
  - ML Literature of music (22)
  - MT Musical instruction and study (14)
- N Fine Arts (122)
  - N Visual arts (General) For photography, see TR (21)
  - NB Sculpture (1)
  - NC Drawing Design Illustration (18)
  - NE Print media (11)
  - NX Arts in general (65)
- P Language and Literature (868)
  - P Philology. Linguistics (353)
  - PA Classical philology (1)
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  - PE English (2)
  - PJ Semitic (2)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (3)
  - PN Literature (General) (360)
    - PN0080 Criticism (12)
    - PN0441 Literary History (3)
    - PN1990 Broadcasting (62)
    - PN1993 Motion Pictures (10)
    - PN2000 Dramatic representation. The Theater (8)
  - PR English literature (23)
  - PS American literature (2)
- Q Science (3050)
  - Q Science (General) (18)
  - QA Mathematics (2366)
    - QA75 Electronic computers. Computer science (1464)
    - QA76 Computer software (250)
  - QB Astronomy (12)
  - QC Physics (462)
  - QD Chemistry (44)
  - QE Geology (3)
  - QH Natural history (104)
    - QH301 Biology (45)
    - QH426 Genetics (19)
  - QK Botany (2)
  - QL Zoology (13)
  - QM Human anatomy (12)
  - QP Physiology (22)
  - QR Microbiology (114)
    - QR180 Immunology (42)
    - QR355 Virology (29)
- R Medicine (3766)
  - R Medicine (General) (214)
  - RA Public aspects of medicine (881)
    - RA0421 Public health. Hygiene. Preventive Medicine (371)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (6)
  - RC Internal medicine (1220)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (70)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (584)
    - RC1200 Sports Medicine (1)
  - RD Surgery (21)
  - RE Ophthalmology (539)
  - RF Otorhinolaryngology (15)
  - RG Gynecology and obstetrics (349)
  - RJ Pediatrics (222)
    - RJ101 Child Health. Child health services (84)
  - RK Dentistry (3)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (46)
  - RS Pharmacy and materia medica (8)
  - RT Nursing (481)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (33)
- S Agriculture (63)
  - S Agriculture (General) (26)
  - SB Plant culture (9)
  - SD Forestry (1)
  - SF Animal culture (15)
- T Technology (2527)
  - T Technology (General) (118)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1102)
  - TC Hydraulic engineering. Ocean engineering (51)
  - TD Environmental technology. Sanitary engineering (13)
  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (20)
  - TH Building construction (66)
  - TJ Mechanical engineering and machinery (438)
  - TK Electrical engineering. Electronics Nuclear engineering (618)
  - TL Motor vehicles. Aeronautics. Astronautics (255)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (5)
  - TR Photography (6)
  - TS Manufactures (1)
  - TX Home economics (48)
- U Military Science (24)
  - U Military Science (General) (2)
- V Naval Science (14)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (7)
- Z Bibliography. Library Science. Information Resources (736)
  - Z665 Library Science. Information Science (641)
  - Z719 Libraries (General) (11)
  - ZA Information resources (89)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)