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Library of Congress Subject Areas (16832)
- A General Works (9)
  - AC Collections. Series. Collected works (1)
  - 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 (1985)
  - B Philosophy (General) (336)
  - BC Logic (1)
  - BD Speculative Philosophy (4)
  - BF Psychology (1577)
  - BH Aesthetics (11)
  - BJ Ethics (37)
  - BL Religion (54)
  - BM Judaism (3)
  - BP Islam. Bahaism. Theosophy, etc (7)
  - BR Christianity (10)
  - 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)
  - CB History of civilization (1)
  - CC Archaeology (9)
  - CD Diplomatics. Archives. Seals (30)
    - CD921 Archives (30)
  - CS Genealogy (1)
  - CT Biography (8)
- D History General and Old World (602)
  - D History (General) (441)
    - D051 Ancient History (2)
    - D111 Medieval History (6)
    - D204 Modern History (25)
    - D501 World War I (30)
    - D731 World War II (46)
    - D839 Post-war History, 1945 on (27)
    - D890 Eastern Hemisphere (8)
    - D901 Europe (General) (6)
  - DA Great Britain (168)
    - DAW Central Europe (1)
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  - DD Germany (30)
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  - DK Russia. Soviet Union. Former Soviet Republics (7)
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  - DS Asia (32)
  - DT Africa (18)
- E History America (66)
  - E11 America (General) (26)
  - E151 United States (General) (44)
- F History United States, Canada, Latin America (60)
  - F001 United States local history (8)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (52)
- G Geography. Anthropology. Recreation (424)
  - G Geography (General) (24)
  - GA Mathematical geography. Cartography (2)
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  - GC Oceanography (93)
  - GE Environmental Sciences (232)
  - GF Human ecology. Anthropogeography (17)
  - GN Anthropology (28)
  - GR Folklore (3)
  - GT Manners and customs (6)
  - GV Recreation Leisure (72)
    - GV557 Sport (20)
- H Social Sciences (6073)
  - H Social Sciences (General) (1764)
  - HA Statistics (261)
  - HB Economic Theory (1807)
  - HC Economic History and Conditions (36)
  - HD Industries. Land use. Labor (672)
    - HD28 Management. Industrial Management (489)
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    - HD58.7 Organizational behavior, change and effectiveness. Corporate culture (131)
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  - HM Sociology (969)
  - HN Social history and conditions. Social problems. Social reform (69)
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  - HT Communities. Classes. Races (85)
  - HV Social pathology. Social and public welfare (45)
  - HX Socialism. Communism. Anarchism (12)
  - HQ The family. Marriage. Women (188)
- J Political Science (1592)
  - J General legislative and executive papers (7)
  - JA Political science (General) (928)
  - JC Political theory (105)
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    - JN101 Great Britain (77)
    - JN1187 Scotland (8)
  - JQ Political institutions Asia (19)
  - JS Local government Municipal government (7)
  - JV Colonies and colonization. Emigration and immigration. International migration (108)
  - JX International law (308)
  - JZ International relations (183)
- K Law (1081)
  - K Law (General) (988)
  - KD England and Wales (84)
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  - KZ Law of Nations (75)
- L Education (279)
  - L Education (General) (213)
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  - LC Special aspects of education (7)
    - LC5201 Education extension. Adult education. Continuing education (2)
  - LG Individual institutions (Asia. Africa) (1)
  - LT Textbooks (2)
- M Music and Books on Music (24)
  - M Music (23)
  - ML Literature of music (1)
- N Fine Arts (207)
  - N Visual arts (General) For photography, see TR (60)
  - NA Architecture (22)
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  - NX Arts in general (101)
- P Language and Literature (1376)
  - P Philology. Linguistics (883)
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  - PL Languages and literatures of Eastern Asia, Africa, Oceania (10)
  - PN Literature (General) (369)
    - PN0080 Criticism (49)
    - PN0441 Literary History (23)
    - PN1990 Broadcasting (38)
    - PN1993 Motion Pictures (74)
    - PN2000 Dramatic representation. The Theater (70)
  - PQ Romance literatures (3)
  - PR English literature (83)
  - PS American literature (55)
  - PT Germanic literature (4)
- Q Science (4128)
  - Q Science (General) (184)
  - QA Mathematics (2605)
    - QA75 Electronic computers. Computer science (2155)
    - QA76 Computer software (49)
  - QC Physics (151)
  - QD Chemistry (64)
  - QE Geology (1)
  - QH Natural history (1149)
    - QH301 Biology (884)
    - QH426 Genetics (285)
  - QK Botany (63)
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  - QP Physiology (75)
  - QR Microbiology (81)
    - QR180 Immunology (4)
    - QR355 Virology (6)
- R Medicine (1474)
  - R Medicine (General) (474)
  - RA Public aspects of medicine (225)
    - RA0421 Public health. Hygiene. Preventive Medicine (98)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (8)
    - RA790 Mental Health (103)
  - RB Pathology (8)
  - RC Internal medicine (622)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (128)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (199)
    - RC0500 Psychoanalysis (128)
    - RC1200 Sports Medicine (162)
  - RD Surgery (4)
  - RE Ophthalmology (69)
  - RF Otorhinolaryngology (2)
  - RG Gynecology and obstetrics (20)
  - RJ Pediatrics (36)
    - RJ101 Child Health. Child health services (30)
  - RK Dentistry (4)
  - RL Dermatology (2)
  - RM Therapeutics. Pharmacology (19)
  - RS Pharmacy and materia medica (1)
  - RT Nursing (41)
  - RV Botanic, Thomsonian, and eclectic medicine (1)
  - RX Homeopathy (2)
  - RZ Other systems of medicine (5)
- S Agriculture (71)
  - S Agriculture (General) (48)
  - SB Plant culture (6)
  - SD Forestry (3)
  - SF Animal culture (1)
  - SH Aquaculture. Fisheries. Angling (15)
- T Technology (329)
  - T Technology (General) (59)
  - TA Engineering (General). Civil engineering (General) (5)
  - 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 (236)
  - TL Motor vehicles. Aeronautics. Astronautics (9)
  - TR Photography (21)
- U Military Science (23)
  - U Military Science (General) (23)
- V Naval Science (1)
  - V Naval Science (General) (1)
- Z Bibliography. Library Science. Information Resources (113)
  - Z004 Books. Writing. Paleography (18)
  - Z665 Library Science. Information Science (7)
  - Z719 Libraries (General) (2)
  - ZA Information resources (89)
    - ZA4050 Electronic information resources (79)
    - ZA4450 Databases (5)