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Library of Congress Subject Areas (18237)
- A General Works (7)
  - AC Collections. Series. Collected works (2)
  - AM Museums (General). Collectors and collecting (General) (1)
  - AS Academies and learned societies (General) (1)
  - AZ History of Scholarship The Humanities (3)
- B Philosophy. Psychology. Religion (1534)
  - B Philosophy (General) (105)
  - BC Logic (7)
  - BD Speculative Philosophy (4)
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  - BL Religion (47)
  - BM Judaism (6)
  - BP Islam. Bahaism. Theosophy, etc (16)
  - BR Christianity (7)
  - BV Practical Theology (6)
    - BV1460 Religious Education (3)
- C Auxiliary Sciences of History (25)
  - C Auxiliary sciences of history (General) (2)
  - CB History of civilization (3)
  - CC Archaeology (6)
  - CD Diplomatics. Archives. Seals (5)
    - CD921 Archives (1)
  - CT Biography (9)
- D History General and Old World (247)
  - D History (General) (94)
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    - D839 Post-war History, 1945 on (3)
    - D880 Developing Countries (1)
    - D901 Europe (General) (6)
  - DA Great Britain (90)
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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 (14)
  - E11 America (General) (6)
  - E151 United States (General) (9)
- F History United States, Canada, Latin America (4)
  - F001 United States local history (2)
  - F1201 Latin America (General) (2)
- G Geography. Anthropology. Recreation (1044)
  - G Geography (General) (58)
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  - GC Oceanography (8)
  - GE Environmental Sciences (453)
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  - GT Manners and customs (17)
  - GV Recreation Leisure (429)
- H Social Sciences (4374)
  - H Social Sciences (General) (936)
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  - HB Economic Theory (648)
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  - HQ The family. Marriage. Woman (120)
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  - HV Social pathology. Social and public welfare (273)
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- J Political Science (203)
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- K Law (741)
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- L Education (1425)
  - L Education (General) (513)
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  - LB Theory and practice of education (900)
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  - LC Special aspects of education (183)
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  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (171)
  - M Music (150)
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  - MT Musical instruction and study (19)
- N Fine Arts (709)
  - N Visual arts (General) For photography, see TR (276)
  - NA Architecture (346)
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  - NX Arts in general (98)
- P Language and Literature (816)
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  - PN Literature (General) (485)
    - PN0080 Criticism (83)
    - PN0441 Literary History (11)
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    - PN2000 Dramatic representation. The Theater (133)
  - PQ Romance literatures (9)
  - PR English literature (142)
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  - PT Germanic literature (2)
  - PZ Childrens literature (8)
- Q Science (4864)
  - Q Science (General) (529)
  - QA Mathematics (2817)
    - QA75 Electronic computers. Computer science (1260)
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  - QB Astronomy (1)
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  - QD Chemistry (887)
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  - QH Natural history (251)
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    - QH426 Genetics (46)
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- R Medicine (2123)
  - R Medicine (General) (341)
  - RA Public aspects of medicine (562)
    - RA0421 Public health. Hygiene. Preventive Medicine (362)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (5)
  - RB Pathology (48)
  - RC Internal medicine (287)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (65)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (72)
    - RC1200 Sports Medicine (72)
  - RD Surgery (14)
  - RE Ophthalmology (21)
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  - RG Gynecology and obstetrics (92)
  - RJ Pediatrics (99)
    - RJ101 Child Health. Child health services (73)
  - RK Dentistry (57)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (185)
  - RS Pharmacy and materia medica (300)
  - RT Nursing (395)
  - RV Botanic, Thomsonian, and eclectic medicine (22)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (59)
- S Agriculture (1931)
  - S Agriculture (General) (1551)
  - SB Plant culture (536)
  - SD Forestry (52)
  - SF Animal culture (99)
  - SH Aquaculture. Fisheries. Angling (67)
- T Technology (3100)
  - T Technology (General) (674)
    - T201 Patents. Trademarks (5)
  - TA Engineering (General). Civil engineering (General) (1107)
  - TC Hydraulic engineering. Ocean engineering (24)
  - TD Environmental technology. Sanitary engineering (234)
  - TE Highway engineering. Roads and pavements (11)
  - TF Railroad engineering and operation (15)
  - TG Bridge engineering (7)
  - TH Building construction (219)
  - TJ Mechanical engineering and machinery (222)
  - TK Electrical engineering. Electronics Nuclear engineering (593)
  - TL Motor vehicles. Aeronautics. Astronautics (99)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (172)
  - TR Photography (25)
  - TS Manufactures (140)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (13)
  - U Military Science (General) (13)
- V Naval Science (73)
  - V Naval Science (General) (21)
  - VM Naval architecture. Shipbuilding. Marine engineering (54)
- Z Bibliography. Library Science. Information Resources (128)
  - Z004 Books. Writing. Paleography (74)
  - Z665 Library Science. Information Science (24)
  - Z719 Libraries (General) (6)
  - ZA Information resources (28)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (5)