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Library of Congress Subject Areas (15122)
- A General Works (7)
  - AM Museums (General). Collectors and collecting (General) (4)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (1)
- B Philosophy. Psychology. Religion (1614)
  - B Philosophy (General) (22)
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- C Auxiliary Sciences of History (4)
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- D History General and Old World (142)
  - D History (General) (27)
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    - D501 World War I (5)
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    - D839 Post-war History, 1945 on (4)
    - D901 Europe (General) (5)
  - DA Great Britain (31)
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  - DE The Mediterranean Region. The Greco-Roman World (5)
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  - DS Asia (37)
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- E History America (22)
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  - E151 United States (General) (17)
- F History United States, Canada, Latin America (24)
  - F1001 Canada (General) (1)
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- G Geography. Anthropology. Recreation (312)
  - G Geography (General) (47)
  - GA Mathematical geography. Cartography (105)
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  - GC Oceanography (2)
  - GE Environmental Sciences (51)
  - GF Human ecology. Anthropogeography (43)
  - GN Anthropology (23)
  - GT Manners and customs (7)
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- H Social Sciences (4594)
  - H Social Sciences (General) (84)
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  - HB Economic Theory (670)
  - HC Economic History and Conditions (93)
  - HD Industries. Land use. Labor (1408)
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  - HQ The family. Marriage. Woman (143)
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  - HT Communities. Classes. Races (89)
  - HV Social pathology. Social and public welfare (173)
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- J Political Science (695)
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  - JV Colonies and colonization. Emigration and immigration. International migration (75)
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- K Law (601)
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- L Education (315)
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    - LB2300 Higher Education (183)
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  - LC Special aspects of education (10)
    - LC5201 Education extension. Adult education. Continuing education (6)
  - LF Individual institutions (Europe) (3)
- M Music and Books on Music (483)
  - M Music (288)
  - ML Literature of music (21)
  - MT Musical instruction and study (14)
- N Fine Arts (113)
  - N Visual arts (General) For photography, see TR (20)
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- P Language and Literature (822)
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- Q Science (2849)
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  - QH Natural history (93)
    - QH301 Biology (39)
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  - QR Microbiology (76)
    - QR180 Immunology (34)
    - QR355 Virology (15)
- R Medicine (3436)
  - R Medicine (General) (203)
  - RA Public aspects of medicine (759)
    - RA0421 Public health. Hygiene. Preventive Medicine (264)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (2)
  - RB Pathology (4)
  - RC Internal medicine (1086)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (54)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (505)
    - RC1200 Sports Medicine (1)
  - RD Surgery (20)
  - RE Ophthalmology (506)
  - RF Otorhinolaryngology (14)
  - RG Gynecology and obstetrics (310)
  - RJ Pediatrics (193)
    - RJ101 Child Health. Child health services (74)
  - RK Dentistry (3)
  - RL Dermatology (9)
  - RM Therapeutics. Pharmacology (29)
  - RS Pharmacy and materia medica (7)
  - RT Nursing (390)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (32)
- S Agriculture (55)
  - S Agriculture (General) (23)
  - SB Plant culture (7)
  - SD Forestry (1)
  - SF Animal culture (12)
- T Technology (2365)
  - T Technology (General) (113)
    - T201 Patents. Trademarks (1)
  - TA Engineering (General). Civil engineering (General) (1052)
  - TC Hydraulic engineering. Ocean engineering (45)
  - TD Environmental technology. Sanitary engineering (10)
  - TE Highway engineering. Roads and pavements (7)
  - TF Railroad engineering and operation (5)
  - TG Bridge engineering (19)
  - TH Building construction (62)
  - TJ Mechanical engineering and machinery (400)
  - TK Electrical engineering. Electronics Nuclear engineering (567)
  - TL Motor vehicles. Aeronautics. Astronautics (214)
  - TN Mining engineering. Metallurgy (2)
  - TP Chemical technology (3)
  - TR Photography (6)
  - TS Manufactures (1)
  - TX Home economics (36)
- U Military Science (22)
  - U Military Science (General) (2)
- V Naval Science (9)
  - V Naval Science (General) (2)
  - VM Naval architecture. Shipbuilding. Marine engineering (6)
- Z Bibliography. Library Science. Information Resources (717)
  - Z665 Library Science. Information Science (625)
  - Z719 Libraries (General) (11)
  - ZA Information resources (86)
    - ZA4050 Electronic information resources (68)
    - ZA4450 Databases (10)