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Library of Congress Subject Areas (17605)
- 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 (1411)
  - B Philosophy (General) (103)
  - BC Logic (7)
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  - BL Religion (47)
  - BM Judaism (6)
  - BP Islam. Bahaism. Theosophy, etc (16)
  - BR Christianity (6)
  - BV Practical Theology (5)
    - 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)
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- D History General and Old World (244)
  - 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 (89)
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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 (978)
  - G Geography (General) (58)
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  - GE Environmental Sciences (416)
  - GF Human ecology. Anthropogeography (91)
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  - GV Recreation Leisure (413)
- H Social Sciences (4085)
  - H Social Sciences (General) (843)
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  - HQ The family. Marriage. Woman (114)
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- J Political Science (191)
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- K Law (722)
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- L Education (1366)
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  - LB Theory and practice of education (869)
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  - LC Special aspects of education (170)
    - LC5201 Education extension. Adult education. Continuing education (82)
  - LF Individual institutions (Europe) (1)
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- M Music and Books on Music (159)
  - M Music (138)
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  - MT Musical instruction and study (19)
- N Fine Arts (682)
  - N Visual arts (General) For photography, see TR (261)
  - NA Architecture (335)
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  - NX Arts in general (94)
- P Language and Literature (812)
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  - PN Literature (General) (482)
    - PN0080 Criticism (83)
    - PN0441 Literary History (11)
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    - PN2000 Dramatic representation. The Theater (131)
  - PQ Romance literatures (9)
  - PR English literature (141)
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  - PT Germanic literature (2)
  - PZ Childrens literature (8)
- Q Science (4679)
  - Q Science (General) (441)
  - QA Mathematics (2756)
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  - QB Astronomy (1)
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  - QD Chemistry (869)
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  - QH Natural history (249)
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  - QK Botany (84)
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    - QR180 Immunology (6)
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- R Medicine (1970)
  - R Medicine (General) (328)
  - RA Public aspects of medicine (506)
    - RA0421 Public health. Hygiene. Preventive Medicine (337)
    - RA1001 Forensic Medicine. Medical jurisprudence. Legal medicine (4)
  - RB Pathology (41)
  - RC Internal medicine (263)
    - RC0254 Neoplasms. Tumors. Oncology (including Cancer) (62)
    - RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry (59)
    - RC1200 Sports Medicine (65)
  - RD Surgery (14)
  - RE Ophthalmology (19)
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  - RG Gynecology and obstetrics (80)
  - RJ Pediatrics (68)
    - RJ101 Child Health. Child health services (42)
  - RK Dentistry (57)
  - RL Dermatology (10)
  - RM Therapeutics. Pharmacology (178)
  - RS Pharmacy and materia medica (294)
  - RT Nursing (372)
  - RV Botanic, Thomsonian, and eclectic medicine (22)
  - RX Homeopathy (1)
  - RZ Other systems of medicine (58)
- S Agriculture (1885)
  - S Agriculture (General) (1514)
  - SB Plant culture (530)
  - SD Forestry (52)
  - SF Animal culture (92)
  - SH Aquaculture. Fisheries. Angling (65)
- T Technology (3012)
  - T Technology (General) (643)
    - T201 Patents. Trademarks (3)
  - TA Engineering (General). Civil engineering (General) (1104)
  - TC Hydraulic engineering. Ocean engineering (23)
  - TD Environmental technology. Sanitary engineering (230)
  - TE Highway engineering. Roads and pavements (10)
  - TF Railroad engineering and operation (14)
  - TG Bridge engineering (7)
  - TH Building construction (183)
  - TJ Mechanical engineering and machinery (218)
  - TK Electrical engineering. Electronics Nuclear engineering (589)
  - TL Motor vehicles. Aeronautics. Astronautics (97)
  - TN Mining engineering. Metallurgy (94)
  - TP Chemical technology (164)
  - TR Photography (25)
  - TS Manufactures (139)
  - TT Handicrafts Arts and crafts (3)
  - TX Home economics (21)
- U Military Science (12)
  - U Military Science (General) (12)
- V Naval Science (71)
  - V Naval Science (General) (21)
  - VM Naval architecture. Shipbuilding. Marine engineering (52)
- Z Bibliography. Library Science. Information Resources (127)
  - Z004 Books. Writing. Paleography (73)
  - Z665 Library Science. Information Science (24)
  - Z719 Libraries (General) (6)
  - ZA Information resources (28)
    - ZA4050 Electronic information resources (17)
    - ZA4450 Databases (5)