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Library of Congress Subject Areas (19492)
- A General Works (29)
  - AC Collections. Series. Collected works (1)
  - AM Museums (General). Collectors and collecting (General) (16)
  - AS Academies and learned societies (General) (2)
  - AZ History of Scholarship The Humanities (12)
- B Philosophy. Psychology. Religion (2286)
  - B Philosophy (General) (19)
  - BF Psychology (2190)
  - BJ Ethics (38)
  - BL Religion (53)
  - 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 (232)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (27)
  - CC Archaeology (216)
  - CD Diplomatics. Archives. Seals (4)
    - CD921 Archives (3)
  - CT Biography (1)
- D History General and Old World (123)
  - D History (General) (98)
    - D051 Ancient History (1)
    - D111 Medieval History (2)
    - D204 Modern History (5)
    - D501 World War I (7)
    - D731 World War II (7)
    - D839 Post-war History, 1945 on (11)
    - D901 Europe (General) (1)
  - DA Great Britain (49)
    - DAW Central Europe (1)
  - DC France (3)
  - DD Germany (3)
  - DK Russia. Soviet Union. Former Soviet Republics (2)
  - DL Northern Europe. Scandinavia (2)
  - DS Asia (5)
  - DT Africa (8)
- E History America (17)
  - E11 America (General) (12)
  - E151 United States (General) (5)
- F History United States, Canada, Latin America (4)
  - F001 United States local history (2)
  - F1201 Latin America (General) (2)
- G Geography. Anthropology. Recreation (2177)
  - G Geography (General) (210)
    - G149 Travel. Voyages and travels (General) (145)
      - G154.9 Travel and state. Tourism (135)
  - GA Mathematical geography. Cartography (3)
  - GB Physical geography (63)
  - GC Oceanography (47)
  - GE Environmental Sciences (940)
  - GF Human ecology. Anthropogeography (68)
  - GN Anthropology (201)
  - GR Folklore (12)
  - GT Manners and customs (70)
    - GT500 Costume. Dress. Fashion (52)
  - GV Recreation Leisure (762)
    - GV1580 Dancing (12)
    - GV561 Sports (698)
      - GV711 Coaching (174)
- H Social Sciences (2853)
  - H Social Sciences (General) (277)
  - HA Statistics (36)
  - HB Economic Theory (36)
  - HC Economic History and Conditions (16)
  - HD Industries. Land use. Labor (556)
    - HD28 Management. Industrial Management (292)
    - HD61 Risk Management (192)
  - HE Transportation and Communications (175)
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    - HF5001 Business (999)
      - HF5410 Marketing. Distribution of Products (250)
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  - HN Social history and conditions. Social problems. Social reform (161)
  - HQ The family. Marriage. Woman (115)
  - HS Societies secret benevolent etc (6)
  - HT Communities. Classes. Races (134)
  - HV Social pathology. Social and public welfare. Criminology (704)
    - HV697 Protection, assistance and relief (122)
      - HV1551 People with disabilities (43)
      - HV888 Children with disabilities (23)
    - HV7231 Criminal Justice Administrations (152)
      - HV7551 Police. Detectives. Constabulary (64)
    - HV8301 Penology. Prisons. Corrections (115)
  - HX Socialism. Communism. Anarchism (2)
- J Political Science (192)
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  - JA Political science (General) (82)
  - JC Political theory (37)
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    - JN101 Great Britain (20)
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  - JV Colonies and colonization. Emigration and immigration. International migration (11)
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- K Law (348)
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    - KDC Scotland (11)
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  - KL Asia and Eurasia, Africa, Pacific Area, and Antarctica (11)
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- L Education (1183)
  - L Education (General) (613)
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  - LB Theory and practice of education (652)
    - LB1139.2 Early childhood education (22)
    - LB1501 Primary Education (71)
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    - LB1705 Education and training of teachers and administrators (18)
    - LB2300 Higher Education (369)
    - LB2361 Curriculum (28)
  - LC Special aspects of education (144)
    - LC5201 Education extension. Adult education. Continuing education (13)
  - LD Individual institutions (United States) (1)
  - LF Individual institutions (Europe) (2)
  - LG Individual institutions (Asia. Africa) (12)
- M Music and Books on Music (57)
  - M Music (48)
  - ML Literature of music (10)
  - MT Musical instruction and study (4)
- N Fine Arts (514)
  - N Visual arts (General) For photography, see TR (194)
  - N4390-5098 Exhibitions (12)
  - NA Architecture (124)
  - NB Sculpture (16)
  - NC Drawing Design Illustration (45)
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  - NK Decorative arts Applied arts Decoration and ornament (5)
  - NX Arts in general (164)
- P Language and Literature (383)
  - P Philology. Linguistics (29)
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    - PB2101 Welsh. Cymric (2)
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  - PE English (15)
  - PI Oriental languages and literatures (1)
  - PJ Semitic (2)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (4)
  - PN Literature (General) (328)
    - PN0080 Criticism (17)
    - PN0441 Literary History (26)
    - PN1990 Broadcasting (22)
    - PN1993 Motion Pictures (70)
    - PN2000 Dramatic representation. The Theater (18)
    - PN4699 Journalism (54)
  - PR English literature (15)
  - PS American literature (3)
  - PZ Childrens literature (1)
- Q Science (6713)
  - Q Science (General) (72)
  - QA Mathematics (1631)
    - QA75 Electronic computers. Computer science (1311)
    - QA76 Computer software (497)
  - QB Astronomy (2418)
  - QC Physics (1885)
  - QD Chemistry (533)
  - QE Geology (88)
    - QE701 Paleontology (36)
  - QH Natural history (1473)
    - QH301 Biology (1093)
    - QH426 Genetics (324)
  - QK Botany (87)
  - QL Zoology (824)
  - QM Human anatomy (153)
  - QP Physiology (398)
  - QR Microbiology (151)
    - QR180 Immunology (19)
    - QR355 Virology (15)
- R Medicine (6528)
  - R Medicine (General) (604)
  - RA Public aspects of medicine (1880)
    - RA0421 Public health. Hygiene. Preventive Medicine (1487)
      - RA0440 Study and Teaching. Research (127)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (119)
    - RA1190 Toxicology. Poisions (74)
  - RB Pathology (9)
  - RC Internal medicine (2708)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (130)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (409)
    - RC1200 Sports Medicine (2171)
  - RD Surgery (51)
  - RE Ophthalmology (19)
  - RF Otorhinolaryngology (4)
  - RG Gynecology and obstetrics (204)
  - RJ Pediatrics (255)
    - RJ101 Child Health. Child health services (177)
  - RK Dentistry (31)
  - RL Dermatology (16)
  - RM Therapeutics. Pharmacology (1107)
  - RS Pharmacy and materia medica (679)
  - RT Nursing (307)
  - RV Botanic, Thomsonian, and eclectic medicine (142)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (30)
- S Agriculture (198)
  - S Agriculture (General) (93)
  - SB Plant culture (21)
  - SD Forestry (12)
  - SF Animal culture (49)
  - SH Aquaculture. Fisheries. Angling (39)
- T Technology (3028)
  - T Technology (General) (589)
    - T58.5 Information Technology (20)
  - TA Engineering (General). Civil engineering (General) (1451)
  - TC Hydraulic engineering. Ocean engineering (181)
  - TD Environmental technology. Sanitary engineering (294)
  - TE Highway engineering. Roads and pavements (71)
  - TF Railroad engineering and operation (10)
  - TG Bridge engineering (8)
  - TH Building construction (346)
  - TJ Mechanical engineering and machinery (198)
  - TK Electrical engineering. Electronics. Nuclear engineering (356)
  - TL Motor vehicles. Aeronautics. Astronautics (63)
  - TN Mining engineering. Metallurgy (33)
  - TP Chemical technology (108)
  - TR Photography (29)
  - TS Manufactures (27)
  - TT Handicrafts Arts and crafts (4)
    - TT490 Clothing manufacture. Dressmaking.Tailoring (1)
  - TX Home economics (303)
    - TX341 Nutrition. Foods and food supply (300)
- U Military Science (14)
  - U Military Science (General) (14)
- V Naval Science (210)
  - V Naval Science (General) (19)
  - VM Naval architecture. Shipbuilding. Marine engineering (196)
- Z Bibliography. Library Science. Information Resources (41)
  - Z004 Books. Writing. Paleography (11)
  - Z665 Library Science. Information Science (9)
  - Z719 Libraries (General) (7)
  - ZA Information resources (23)
    - ZA4050 Electronic information resources (13)
    - ZA4450 Databases (2)