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Library of Congress Subject Areas (21125)
- A General Works (35)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (18)
  - AS Academies and learned societies (General) (3)
  - AZ History of Scholarship The Humanities (15)
- B Philosophy. Psychology. Religion (2529)
  - B Philosophy (General) (19)
  - BF Psychology (2424)
  - BJ Ethics (41)
  - BL Religion (58)
  - BP Islam. Bahaism. Theosophy, etc (9)
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  - BR Christianity (11)
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  - BT Doctrinal Theology (1)
  - BV Practical Theology (2)
- C Auxiliary Sciences of History (244)
  - C Auxiliary sciences of history (General) (3)
  - CB History of civilization (28)
  - CC Archaeology (225)
  - CD Diplomatics. Archives. Seals (5)
    - CD921 Archives (4)
  - CT Biography (1)
- D History General and Old World (127)
  - D History (General) (101)
    - D051 Ancient History (1)
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    - 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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- E History America (18)
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  - E151 United States (General) (6)
- F History United States, Canada, Latin America (5)
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  - F1201 Latin America (General) (3)
- G Geography. Anthropology. Recreation (2408)
  - G Geography (General) (227)
    - G149 Travel. Voyages and travels (General) (156)
      - G154.9 Travel and state. Tourism (146)
  - GA Mathematical geography. Cartography (4)
  - GB Physical geography (67)
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  - GE Environmental Sciences (1045)
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  - GT Manners and customs (85)
    - GT500 Costume. Dress. Fashion (66)
  - GV Recreation Leisure (857)
    - GV1580 Dancing (14)
    - GV561 Sports (786)
      - GV711 Coaching (194)
- H Social Sciences (3161)
  - H Social Sciences (General) (356)
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  - HN Social history and conditions. Social problems. Social reform (174)
  - HQ The family. Marriage. Woman (130)
  - HS Societies secret benevolent etc (6)
  - HT Communities. Classes. Races (173)
  - HV Social pathology. Social and public welfare. Criminology (764)
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  - HX Socialism. Communism. Anarchism (2)
- J Political Science (207)
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  - JV Colonies and colonization. Emigration and immigration. International migration (12)
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- K Law (392)
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- L Education (1333)
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    - LB2300 Higher Education (425)
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  - LC Special aspects of education (160)
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  - LD Individual institutions (United States) (2)
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  - LG Individual institutions (Asia. Africa) (12)
- M Music and Books on Music (65)
  - M Music (56)
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- N Fine Arts (551)
  - N Visual arts (General) For photography, see TR (203)
  - N4390-5098 Exhibitions (22)
  - NA Architecture (128)
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  - NX Arts in general (176)
- P Language and Literature (406)
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  - PN Literature (General) (349)
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    - PN2000 Dramatic representation. The Theater (23)
    - PN4699 Journalism (57)
  - PR English literature (15)
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  - PZ Childrens literature (2)
- Q Science (7170)
  - Q Science (General) (78)
  - QA Mathematics (1745)
    - QA75 Electronic computers. Computer science (1383)
    - QA76 Computer software (543)
  - QB Astronomy (2588)
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  - QD Chemistry (546)
  - QE Geology (102)
    - QE701 Paleontology (49)
  - QH Natural history (1542)
    - QH301 Biology (1153)
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  - QK Botany (99)
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  - QM Human anatomy (157)
  - QP Physiology (451)
  - QR Microbiology (158)
    - QR180 Immunology (20)
    - QR355 Virology (15)
- R Medicine (7061)
  - R Medicine (General) (635)
  - RA Public aspects of medicine (2051)
    - RA0421 Public health. Hygiene. Preventive Medicine (1611)
      - RA0440 Study and Teaching. Research (130)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (129)
    - RA1190 Toxicology. Poisions (84)
  - RB Pathology (9)
  - RC Internal medicine (2920)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (141)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (424)
    - RC1200 Sports Medicine (2353)
  - RD Surgery (58)
  - RE Ophthalmology (20)
  - RF Otorhinolaryngology (4)
  - RG Gynecology and obstetrics (222)
  - RJ Pediatrics (277)
    - RJ101 Child Health. Child health services (196)
  - RK Dentistry (31)
  - RL Dermatology (22)
  - RM Therapeutics. Pharmacology (1142)
  - RS Pharmacy and materia medica (772)
  - RT Nursing (373)
  - RV Botanic, Thomsonian, and eclectic medicine (143)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (31)
- S Agriculture (213)
  - S Agriculture (General) (96)
  - SB Plant culture (22)
  - SD Forestry (15)
  - SF Animal culture (54)
  - SH Aquaculture. Fisheries. Angling (43)
- T Technology (3308)
  - T Technology (General) (675)
    - T58.5 Information Technology (33)
  - TA Engineering (General). Civil engineering (General) (1606)
  - TC Hydraulic engineering. Ocean engineering (194)
  - TD Environmental technology. Sanitary engineering (303)
  - TE Highway engineering. Roads and pavements (73)
  - TF Railroad engineering and operation (10)
  - TG Bridge engineering (8)
  - TH Building construction (352)
  - TJ Mechanical engineering and machinery (199)
  - TK Electrical engineering. Electronics. Nuclear engineering (367)
  - TL Motor vehicles. Aeronautics. Astronautics (64)
  - TN Mining engineering. Metallurgy (36)
  - TP Chemical technology (109)
  - TR Photography (31)
  - TS Manufactures (28)
  - TT Handicrafts Arts and crafts (6)
    - TT490 Clothing manufacture. Dressmaking.Tailoring (3)
  - TX Home economics (335)
    - TX341 Nutrition. Foods and food supply (332)
- U Military Science (15)
  - U Military Science (General) (15)
- V Naval Science (244)
  - V Naval Science (General) (25)
  - VM Naval architecture. Shipbuilding. Marine engineering (225)
- Z Bibliography. Library Science. Information Resources (45)
  - Z004 Books. Writing. Paleography (12)
  - Z665 Library Science. Information Science (11)
  - Z719 Libraries (General) (8)
  - ZA Information resources (24)
    - ZA4050 Electronic information resources (13)
    - ZA4450 Databases (2)