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Library of Congress Subject Areas (18382)
- A General Works (8)
  - AM Museums (General). Collectors and collecting (General) (5)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (2134)
  - B Philosophy (General) (34)
  - BC Logic (4)
  - BD Speculative Philosophy (1)
  - BF Psychology (2033)
  - BH Aesthetics (3)
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  - BL Religion (17)
  - BM Judaism (7)
  - BP Islam. Bahaism. Theosophy, etc (6)
  - BQ Buddhism (3)
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- C Auxiliary Sciences of History (8)
  - C Auxiliary sciences of history (General) (1)
  - CC Archaeology (2)
  - CD Diplomatics. Archives. Seals (3)
    - CD921 Archives (3)
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- D History General and Old World (196)
  - D History (General) (37)
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    - D839 Post-war History, 1945 on (5)
    - D901 Europe (General) (6)
  - DA Great Britain (36)
    - DAW Central Europe (4)
  - DB Austria (1)
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  - DE The Mediterranean Region. The Greco-Roman World (7)
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    - DJK Eastern Europe (1)
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  - DS Asia (50)
  - DT Africa (43)
- E History America (25)
  - E11 America (General) (3)
  - E151 United States (General) (19)
- F History United States, Canada, Latin America (37)
  - F1001 Canada (General) (2)
  - F1201 Latin America (General) (32)
- G Geography. Anthropology. Recreation (459)
  - G Geography (General) (48)
  - GA Mathematical geography. Cartography (118)
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  - GE Environmental Sciences (104)
  - GF Human ecology. Anthropogeography (123)
  - GN Anthropology (35)
  - GT Manners and customs (15)
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- H Social Sciences (5832)
  - H Social Sciences (General) (107)
  - HA Statistics (168)
  - HB Economic Theory (794)
  - HC Economic History and Conditions (129)
  - HD Industries. Land use. Labor (1717)
    - HD28 Management. Industrial Management (881)
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  - HN Social history and conditions. Social problems. Social reform (608)
  - HQ The family. Marriage. Woman (194)
  - HS Societies secret benevolent etc (5)
  - HT Communities. Classes. Races (152)
  - HV Social pathology. Social and public welfare (226)
  - HX Socialism. Communism. Anarchism (9)
- J Political Science (984)
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  - JV Colonies and colonization. Emigration and immigration. International migration (113)
  - JX International law (149)
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- K Law (792)
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    - KDC Scotland (1)
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  - KZ Law of Nations (56)
- L Education (433)
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  - LB Theory and practice of education (329)
    - LB1501 Primary Education (9)
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    - LB2300 Higher Education (233)
    - LB2361 Curriculum (1)
  - LC Special aspects of education (20)
    - LC5201 Education extension. Adult education. Continuing education (7)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (556)
  - M Music (333)
  - ML Literature of music (23)
  - MT Musical instruction and study (14)
- N Fine Arts (139)
  - N Visual arts (General) For photography, see TR (22)
  - NB Sculpture (1)
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  - NE Print media (12)
  - NX Arts in general (68)
- P Language and Literature (982)
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  - PN Literature (General) (401)
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    - PN0441 Literary History (3)
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    - PN2000 Dramatic representation. The Theater (9)
  - PQ Romance literatures (1)
  - PR English literature (27)
  - PS American literature (4)
  - PZ Childrens literature (1)
- Q Science (3575)
  - Q Science (General) (21)
  - QA Mathematics (2736)
    - QA75 Electronic computers. Computer science (1708)
    - QA76 Computer software (280)
  - QB Astronomy (12)
  - QC Physics (525)
  - QD Chemistry (54)
  - QE Geology (5)
  - QH Natural history (127)
    - QH301 Biology (61)
    - QH426 Genetics (21)
  - QK Botany (5)
  - QL Zoology (18)
  - QM Human anatomy (15)
  - QP Physiology (28)
  - QR Microbiology (197)
    - QR180 Immunology (74)
    - QR355 Virology (60)
- R Medicine (4664)
  - R Medicine (General) (233)
  - RA Public aspects of medicine (1310)
    - RA0421 Public health. Hygiene. Preventive Medicine (674)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (8)
  - RC Internal medicine (1564)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (91)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (783)
    - RC1200 Sports Medicine (1)
  - RD Surgery (23)
  - RE Ophthalmology (633)
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  - RG Gynecology and obstetrics (418)
  - RJ Pediatrics (305)
    - RJ101 Child Health. Child health services (121)
  - RK Dentistry (3)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (53)
  - RS Pharmacy and materia medica (10)
  - RT Nursing (630)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (37)
- S Agriculture (73)
  - S Agriculture (General) (31)
  - SB Plant culture (12)
  - SD Forestry (1)
  - SF Animal culture (16)
- T Technology (2963)
  - T Technology (General) (143)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1305)
  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (23)
  - TE Highway engineering. Roads and pavements (9)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (26)
  - TH Building construction (139)
  - TJ Mechanical engineering and machinery (537)
  - TK Electrical engineering. Electronics Nuclear engineering (701)
  - TL Motor vehicles. Aeronautics. Astronautics (302)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (6)
  - TR Photography (6)
  - TS Manufactures (4)
  - TX Home economics (69)
- U Military Science (30)
  - U Military Science (General) (2)
- V Naval Science (21)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (9)
- Z Bibliography. Library Science. Information Resources (777)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (676)
  - Z719 Libraries (General) (11)
  - ZA Information resources (91)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)