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Library of Congress Subject Areas (17634)
- A General Works (10)
  - AC Collections. Series. Collected works (2)
  - AI Indexes (General) (3)
  - AM Museums (General). Collectors and collecting (General) (3)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (2)
- B Philosophy. Psychology. Religion (2160)
  - B Philosophy (General) (369)
  - BC Logic (1)
  - BD Speculative Philosophy (5)
  - BF Psychology (1725)
  - BH Aesthetics (15)
  - BJ Ethics (39)
  - BL Religion (60)
  - BM Judaism (3)
  - BP Islam. Bahaism. Theosophy, etc (9)
  - BR Christianity (12)
  - BS The Bible (1)
  - BT Doctrinal Theology (2)
  - BV Practical Theology (2)
  - BX Christian Denominations (1)
- C Auxiliary Sciences of History (49)
  - C Auxiliary sciences of history (General) (2)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
  - CS Genealogy (1)
  - CT Biography (9)
- D History General and Old World (630)
  - D History (General) (455)
    - D051 Ancient History (2)
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    - D204 Modern History (30)
    - D501 World War I (34)
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    - D839 Post-war History, 1945 on (32)
    - D890 Eastern Hemisphere (8)
    - D901 Europe (General) (8)
  - DA Great Britain (188)
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  - DE The Mediterranean Region. The Greco-Roman World (1)
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  - DK Russia. Soviet Union. Former Soviet Republics (8)
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  - DS Asia (32)
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- E History America (71)
  - E11 America (General) (27)
  - E151 United States (General) (49)
- F History United States, Canada, Latin America (66)
  - F001 United States local history (11)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (55)
- G Geography. Anthropology. Recreation (445)
  - G Geography (General) (24)
  - GA Mathematical geography. Cartography (2)
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  - GC Oceanography (97)
  - GE Environmental Sciences (241)
  - GF Human ecology. Anthropogeography (19)
  - GN Anthropology (33)
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  - GT Manners and customs (7)
  - GV Recreation Leisure (76)
    - GV557 Sport (22)
- H Social Sciences (6313)
  - H Social Sciences (General) (1878)
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  - HB Economic Theory (1830)
  - HC Economic History and Conditions (39)
  - HD Industries. Land use. Labor (681)
    - HD28 Management. Industrial Management (493)
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    - HD58.7 Organizational behavior, change and effectiveness. Corporate culture (135)
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  - HJ Public Finance (68)
  - HM Sociology (1025)
  - HN Social history and conditions. Social problems. Social reform (94)
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  - HT Communities. Classes. Races (100)
  - HV Social pathology. Social and public welfare (54)
  - HX Socialism. Communism. Anarchism (16)
  - HQ The family. Marriage. Women (207)
- J Political Science (1667)
  - J General legislative and executive papers (8)
  - JA Political science (General) (970)
  - JC Political theory (123)
  - JF Political institutions (General) (50)
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    - JN101 Great Britain (78)
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  - JQ Political institutions Asia (21)
  - JS Local government Municipal government (13)
  - JV Colonies and colonization. Emigration and immigration. International migration (113)
  - JX International law (311)
  - JZ International relations (198)
- K Law (1121)
  - K Law (General) (1023)
  - KD England and Wales (90)
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  - KZ Law of Nations (79)
- L Education (322)
  - L Education (General) (245)
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    - LC5201 Education extension. Adult education. Continuing education (4)
  - LD Individual institutions (United States) (1)
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  - LG Individual institutions (Asia. Africa) (1)
  - LT Textbooks (3)
- M Music and Books on Music (24)
  - M Music (23)
  - ML Literature of music (1)
- N Fine Arts (233)
  - N Visual arts (General) For photography, see TR (72)
  - NA Architecture (26)
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  - ND Painting (52)
  - NE Print media (12)
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  - NX Arts in general (111)
- P Language and Literature (1435)
  - P Philology. Linguistics (901)
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    - PB1501 Gaelic (Scottish Gaelic, Erse) (2)
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  - PI Oriental languages and literatures (18)
  - PJ Semitic (16)
  - PK Indo-Iranian (2)
  - PL Languages and literatures of Eastern Asia, Africa, Oceania (12)
  - PN Literature (General) (393)
    - PN0080 Criticism (53)
    - PN0441 Literary History (25)
    - PN1990 Broadcasting (38)
    - PN1993 Motion Pictures (74)
    - PN2000 Dramatic representation. The Theater (75)
  - PQ Romance literatures (4)
  - PR English literature (96)
  - PS American literature (59)
  - PT Germanic literature (4)
- Q Science (4330)
  - Q Science (General) (227)
  - QA Mathematics (2711)
    - QA75 Electronic computers. Computer science (2230)
    - QA76 Computer software (61)
  - QC Physics (152)
  - QD Chemistry (72)
  - QE Geology (1)
  - QH Natural history (1187)
    - QH301 Biology (916)
    - QH426 Genetics (298)
  - QK Botany (73)
  - QL Zoology (48)
  - QM Human anatomy (5)
  - QP Physiology (87)
  - QR Microbiology (107)
    - QR180 Immunology (6)
    - QR355 Virology (6)
- R Medicine (1541)
  - R Medicine (General) (494)
  - RA Public aspects of medicine (237)
    - RA0421 Public health. Hygiene. Preventive Medicine (104)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (8)
    - RA790 Mental Health (111)
  - RB Pathology (9)
  - RC Internal medicine (648)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (134)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (212)
    - RC0500 Psychoanalysis (135)
    - RC1200 Sports Medicine (163)
  - RD Surgery (4)
  - RE Ophthalmology (69)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (21)
  - RJ Pediatrics (39)
    - RJ101 Child Health. Child health services (33)
  - RK Dentistry (4)
  - RL Dermatology (3)
  - RM Therapeutics. Pharmacology (26)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (45)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (10)
- S Agriculture (78)
  - S Agriculture (General) (53)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (4)
  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (358)
  - T Technology (General) (73)
  - TA Engineering (General). Civil engineering (General) (7)
  - TD Environmental technology. Sanitary engineering (3)
  - TF Railroad engineering and operation (4)
  - TH Building construction (2)
  - TJ Mechanical engineering and machinery (1)
  - TK Electrical engineering. Electronics Nuclear engineering (247)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (25)
  - TS Manufactures (1)
- U Military Science (30)
  - U Military Science (General) (30)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (117)
  - Z004 Books. Writing. Paleography (19)
  - Z665 Library Science. Information Science (8)
  - Z719 Libraries (General) (3)
  - ZA Information resources (90)
    - ZA4050 Electronic information resources (80)
    - ZA4450 Databases (6)