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Library of Congress Subject Areas (20407)
- A General Works (33)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (16)
  - AS Academies and learned societies (General) (3)
  - AZ History of Scholarship The Humanities (15)
- B Philosophy. Psychology. Religion (2425)
  - B Philosophy (General) (19)
  - BF Psychology (2325)
  - BJ Ethics (38)
  - BL Religion (57)
  - BP Islam. Bahaism. Theosophy, etc (9)
  - BQ Buddhism (2)
  - BR Christianity (9)
  - BS The Bible (4)
  - BT Doctrinal Theology (1)
  - BV Practical Theology (2)
- C Auxiliary Sciences of History (241)
  - C Auxiliary sciences of history (General) (3)
  - CB History of civilization (28)
  - CC Archaeology (223)
  - CD Diplomatics. Archives. Seals (4)
    - CD921 Archives (3)
  - CT Biography (1)
- D History General and Old World (125)
  - D History (General) (99)
    - D051 Ancient History (1)
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    - D204 Modern History (5)
    - D501 World War I (7)
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    - D839 Post-war History, 1945 on (11)
    - D901 Europe (General) (1)
  - DA Great Britain (50)
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  - DS Asia (6)
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- E History America (18)
  - E11 America (General) (12)
  - E151 United States (General) (6)
- F History United States, Canada, Latin America (5)
  - F001 United States local history (2)
  - F1201 Latin America (General) (3)
- G Geography. Anthropology. Recreation (2291)
  - G Geography (General) (216)
    - G149 Travel. Voyages and travels (General) (149)
      - G154.9 Travel and state. Tourism (139)
  - GA Mathematical geography. Cartography (3)
  - GB Physical geography (63)
  - GC Oceanography (47)
  - GE Environmental Sciences (1004)
  - GF Human ecology. Anthropogeography (68)
  - GN Anthropology (209)
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  - GT Manners and customs (80)
    - GT500 Costume. Dress. Fashion (62)
  - GV Recreation Leisure (794)
    - GV1580 Dancing (13)
    - GV561 Sports (729)
      - GV711 Coaching (180)
- H Social Sciences (3006)
  - H Social Sciences (General) (333)
  - HA Statistics (36)
  - HB Economic Theory (36)
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  - HD Industries. Land use. Labor (558)
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  - HN Social history and conditions. Social problems. Social reform (163)
  - HQ The family. Marriage. Woman (119)
  - HS Societies secret benevolent etc (6)
  - HT Communities. Classes. Races (142)
  - HV Social pathology. Social and public welfare. Criminology (735)
    - HV697 Protection, assistance and relief (128)
      - HV1551 People with disabilities (45)
      - HV888 Children with disabilities (22)
    - HV7231 Criminal Justice Administrations (167)
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  - HX Socialism. Communism. Anarchism (2)
- J Political Science (202)
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  - JA Political science (General) (90)
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  - JV Colonies and colonization. Emigration and immigration. International migration (12)
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- K Law (370)
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- L Education (1245)
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  - LB Theory and practice of education (690)
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    - LB1501 Primary Education (81)
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    - LB2300 Higher Education (393)
    - LB2361 Curriculum (28)
  - LC Special aspects of education (156)
    - LC5201 Education extension. Adult education. Continuing education (13)
  - LD Individual institutions (United States) (2)
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  - LG Individual institutions (Asia. Africa) (12)
- M Music and Books on Music (62)
  - M Music (53)
  - ML Literature of music (10)
  - MT Musical instruction and study (4)
- N Fine Arts (536)
  - N Visual arts (General) For photography, see TR (201)
  - N4390-5098 Exhibitions (17)
  - NA Architecture (126)
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  - NX Arts in general (173)
- P Language and Literature (398)
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  - PN Literature (General) (341)
    - PN0080 Criticism (17)
    - PN0441 Literary History (27)
    - PN1990 Broadcasting (22)
    - PN1993 Motion Pictures (71)
    - PN2000 Dramatic representation. The Theater (21)
    - PN4699 Journalism (55)
  - PR English literature (15)
  - PS American literature (3)
  - PZ Childrens literature (2)
- Q Science (6940)
  - Q Science (General) (74)
  - QA Mathematics (1684)
    - QA75 Electronic computers. Computer science (1361)
    - QA76 Computer software (499)
  - QB Astronomy (2503)
  - QC Physics (1966)
  - QD Chemistry (542)
  - QE Geology (93)
    - QE701 Paleontology (41)
  - QH Natural history (1525)
    - QH301 Biology (1141)
    - QH426 Genetics (329)
  - QK Botany (89)
  - QL Zoology (835)
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  - QP Physiology (413)
  - QR Microbiology (155)
    - QR180 Immunology (20)
    - QR355 Virology (15)
- R Medicine (6861)
  - R Medicine (General) (622)
  - RA Public aspects of medicine (1991)
    - RA0421 Public health. Hygiene. Preventive Medicine (1577)
      - RA0440 Study and Teaching. Research (128)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (127)
    - RA1190 Toxicology. Poisions (81)
  - RB Pathology (9)
  - RC Internal medicine (2851)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (135)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (413)
    - RC1200 Sports Medicine (2299)
  - RD Surgery (53)
  - RE Ophthalmology (19)
  - RF Otorhinolaryngology (4)
  - RG Gynecology and obstetrics (212)
  - RJ Pediatrics (273)
    - RJ101 Child Health. Child health services (192)
  - RK Dentistry (31)
  - RL Dermatology (18)
  - RM Therapeutics. Pharmacology (1113)
  - RS Pharmacy and materia medica (734)
  - RT Nursing (344)
  - RV Botanic, Thomsonian, and eclectic medicine (143)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (30)
- S Agriculture (208)
  - S Agriculture (General) (93)
  - SB Plant culture (21)
  - SD Forestry (15)
  - SF Animal culture (53)
  - SH Aquaculture. Fisheries. Angling (43)
- T Technology (3182)
  - T Technology (General) (630)
    - T58.5 Information Technology (24)
  - TA Engineering (General). Civil engineering (General) (1550)
  - TC Hydraulic engineering. Ocean engineering (187)
  - TD Environmental technology. Sanitary engineering (299)
  - TE Highway engineering. Roads and pavements (72)
  - TF Railroad engineering and operation (10)
  - TG Bridge engineering (8)
  - TH Building construction (351)
  - TJ Mechanical engineering and machinery (198)
  - TK Electrical engineering. Electronics. Nuclear engineering (358)
  - TL Motor vehicles. Aeronautics. Astronautics (64)
  - TN Mining engineering. Metallurgy (33)
  - TP Chemical technology (109)
  - TR Photography (30)
  - TS Manufactures (27)
  - TT Handicrafts Arts and crafts (4)
    - TT490 Clothing manufacture. Dressmaking.Tailoring (1)
  - TX Home economics (318)
    - TX341 Nutrition. Foods and food supply (315)
- U Military Science (14)
  - U Military Science (General) (14)
- V Naval Science (234)
  - V Naval Science (General) (20)
  - VM Naval architecture. Shipbuilding. Marine engineering (219)
- Z Bibliography. Library Science. Information Resources (43)
  - Z004 Books. Writing. Paleography (12)
  - Z665 Library Science. Information Science (11)
  - Z719 Libraries (General) (7)
  - ZA Information resources (23)
    - ZA4050 Electronic information resources (13)
    - ZA4450 Databases (2)