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Library of Congress Subject Areas (18812)
- 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 (2188)
  - B Philosophy (General) (35)
  - BC Logic (4)
  - BD Speculative Philosophy (1)
  - BF Psychology (2085)
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  - BL Religion (17)
  - BM Judaism (7)
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  - BQ Buddhism (3)
  - BR Christianity (3)
- C Auxiliary Sciences of History (9)
  - C Auxiliary sciences of history (General) (1)
  - CB History of civilization (1)
  - CC Archaeology (2)
  - CD Diplomatics. Archives. Seals (3)
    - CD921 Archives (3)
  - CT Biography (1)
- D History General and Old World (203)
  - D History (General) (42)
    - D111 Medieval History (1)
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    - D839 Post-war History, 1945 on (6)
    - D901 Europe (General) (6)
  - DA Great Britain (37)
    - 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 (55)
  - 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 (476)
  - G Geography (General) (49)
  - GA Mathematical geography. Cartography (118)
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  - GE Environmental Sciences (116)
  - GF Human ecology. Anthropogeography (129)
  - GN Anthropology (35)
  - GT Manners and customs (15)
  - GV Recreation Leisure (25)
- H Social Sciences (5961)
  - H Social Sciences (General) (108)
  - HA Statistics (178)
  - HB Economic Theory (814)
  - HC Economic History and Conditions (134)
  - HD Industries. Land use. Labor (1753)
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  - HN Social history and conditions. Social problems. Social reform (643)
  - HQ The family. Marriage. Woman (198)
  - HS Societies secret benevolent etc (5)
  - HT Communities. Classes. Races (153)
  - HV Social pathology. Social and public welfare (229)
  - HX Socialism. Communism. Anarchism (9)
- J Political Science (1035)
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  - JV Colonies and colonization. Emigration and immigration. International migration (125)
  - JX International law (155)
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- K Law (821)
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  - KD England and Wales (85)
    - KDC Scotland (1)
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- L Education (442)
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  - LB Theory and practice of education (334)
    - LB1501 Primary Education (9)
    - LB1603 Secondary Education. High schools (12)
    - LB2300 Higher Education (236)
    - LB2361 Curriculum (1)
  - LC Special aspects of education (21)
    - LC5201 Education extension. Adult education. Continuing education (7)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (562)
  - M Music (338)
  - ML Literature of music (23)
  - MT Musical instruction and study (17)
- N Fine Arts (141)
  - N Visual arts (General) For photography, see TR (22)
  - NB Sculpture (1)
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  - NX Arts in general (68)
- P Language and Literature (1005)
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  - PN Literature (General) (415)
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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 (3670)
  - Q Science (General) (21)
  - QA Mathematics (2794)
    - QA75 Electronic computers. Computer science (1743)
    - QA76 Computer software (288)
  - QB Astronomy (12)
  - QC Physics (535)
  - QD Chemistry (72)
  - QE Geology (5)
  - QH Natural history (127)
    - QH301 Biology (61)
    - QH426 Genetics (21)
  - QK Botany (5)
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  - QM Human anatomy (17)
  - QP Physiology (29)
  - QR Microbiology (207)
    - QR180 Immunology (80)
    - QR355 Virology (60)
- R Medicine (4811)
  - R Medicine (General) (238)
  - RA Public aspects of medicine (1397)
    - RA0421 Public health. Hygiene. Preventive Medicine (749)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (8)
  - RC Internal medicine (1598)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (93)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (803)
    - RC1200 Sports Medicine (1)
  - RD Surgery (24)
  - RE Ophthalmology (642)
  - RF Otorhinolaryngology (18)
  - RG Gynecology and obstetrics (436)
  - RJ Pediatrics (318)
    - RJ101 Child Health. Child health services (128)
  - RK Dentistry (3)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (55)
  - RS Pharmacy and materia medica (12)
  - RT Nursing (646)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (41)
- S Agriculture (78)
  - S Agriculture (General) (35)
  - SB Plant culture (12)
  - SD Forestry (1)
  - SF Animal culture (16)
- T Technology (3071)
  - T Technology (General) (161)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1346)
  - TC Hydraulic engineering. Ocean engineering (58)
  - TD Environmental technology. Sanitary engineering (25)
  - TE Highway engineering. Roads and pavements (9)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (27)
  - TH Building construction (150)
  - TJ Mechanical engineering and machinery (561)
  - TK Electrical engineering. Electronics Nuclear engineering (725)
  - TL Motor vehicles. Aeronautics. Astronautics (309)
  - TN Mining engineering. Metallurgy (3)
  - TP Chemical technology (6)
  - TR Photography (6)
  - TS Manufactures (5)
  - TX Home economics (76)
- U Military Science (32)
  - U Military Science (General) (3)
- V Naval Science (22)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (10)
- Z Bibliography. Library Science. Information Resources (784)
  - Z004 Books. Writing. Paleography (2)
  - Z665 Library Science. Information Science (682)
  - Z719 Libraries (General) (11)
  - ZA Information resources (92)
    - ZA4050 Electronic information resources (69)
    - ZA4450 Databases (10)